Also known as the act of peeing in SOMEONE ELSE'S pants in the state of being scared, freightened, or abosolutely horrified.
Person A: Dude, did you just Yommi in my pants??
Person B: ......sorry
Person A: HAHA did you hear? Joe just yommi-ed in Jack's pants.
Person B: I heard, didn't they watch a scary movie?