After numerous minutes spent researching this online tinkle phenomenon I have put together a list of proper peecabulary to help you appropriately express your level of excitement.

(from Urban Dictionary)

1. Peed My Pants Off – Combination of “I nearly peed my pants” and “I laughed my ass off”

Expression is typically accidentally spewed after relating a funny or embarrasing story while inebriated or during blonde moments.
“I laughed so hard I nearly peed my pants off”

2. ipmp – I peed my pants. OMG, {some hilarious joke} IPMP

3. pmp – pmp: Peed my pants – more than “lol” How do you punish Helen Keller? ..Give her a basketball and tel her to read it.

4. pmpo – Peed My Pants Off – PMPO should be used in all text correspondence to relentlessly tease someone who has recently accidentally meshed “laughed my ass off” with “nearly peed my pants”, creating the puzzling yet almost familiar-sounding expression “peed my pants off” (Text: “Did you see the Bon Qui Qui at King Burger video on youtube?” Reply: “Yes – PMPO”)

5. jpmpwgtm – Acronym for the common phrase “just peed my pants while grinning to myself.” It is usually used when an individual has literally peed his or her pants after being told a funny joke. Notice it is not laughing and peeing but grinning and peeing. The word is used mainly by people who have mangled vocal cords and also those who generally hate laughter.
Tardy: “Guess what?”
Farty: “What?”
Tardy: “Chicken butt!”
Farty: “JPMPWGTM!!!! THAT’S WUZ SOOOOO FUNNY!!!!! I ACTUALLY CRAPPED MY PANTS TOO HAHAH!”

6. Peeing myself – For a certain cause such as laughing, fear, or waiting to long you pee without warning into your pants making a visible stain where your pee was running depending on what your wearing.
i had a friend over, he was playing a one-player game. i stood behind him, and i just started peeing. “oh my god, i just peed my pants” i said. my friend didn’t belive me so i showed my jeans. i like peeing myself

7. piddidle – Laughing so hard that you peed your pants. Oh snap! You just made me piddidle my pants! I just piddidled my pants!!

8. IPMPAL – I Peed my pants a little – LOL so much I PMPAL

9. p.i.m.p – peed in my pants

(similar to the familiar j.i.m.p–jizzed in my pants)
Girl 1: Hey didn’t you say you had to go to the bathroom?
Girl 2; Uhhh its a little late…i already p.i.m.p
Girl 1: UM EW!!!

10. Urination Proclamation – When you laugh so hard that you pee your pants, and then mention it to your friends.
Marty: Hahahahahaha. I just peed my pants. John: Ew. Dont give me a urination proclamation.

11. peecrastination – When you have to pee, but you keep putting it off. Peecrastination leads to that “Ahhh-why-did-I-wait-so-long feeling when you finally go.

12. LSHIPMP – Laughing So Hard I Peed My Pants – OMG THAT JOKE HAD ME LSHIPMP

13. Drop a quarter – 1. To urinate in your pants 2. An alternative to phrases such as; ‘pissed myself’ or ‘peed my pants’
“Dude! When Julie tripped a Foot Locker, I was about to drop a quarter!”

14.  Motzarting -Screaming while peeing in a public urinal as to make others frightened.  I went to the bathroom and there was this old man mozarting. I got so afraid that peed my pants while running out. All was well that ended well.

15.  JPIMPL -abbr.–Just Peed In My Pants Laughing. “that’s so funny, JPIMPL” or just “JPIMPL”

16.  loltipmp – The not so short but still true: Laugh Out Loud Til I Peed My Pants. This phrase is missed used too often and incorrectly. Seriously how often does an adult laugh hard enough for this to happen, excluding my ex wife when some one I know now meets her and tells her what a great guy I are? Come-on counts the times scroll the pictures thru your mind. Never, never, never. Aussie slang version: loltipm Laugh Out Loud Til I Pissed Meself

(girl) yeah! im LSHIAPMP

18.  rotflmaoshtipm – abbreviation, rolling on the floor laughing my a* off so hard that i peed my pants a little bit.