Simp

S - Squirt (ed), shoot/shot, soil (ed)
I - In
M - My
P - Pants

Usually seen on TikTok, Simp is used to let someone in the video or live know that they are SOOO hot, that the commenter has just SIMP. Terminology for prematurely ejaculating in their pants.

You are so hot, quit making me SIMP for you.

I've just SIMP because of you.