When your college roommate brings home a new girl from the bar and instead of getting the job done they stay up all night talking and GIGGLING, which keeps you up! Hit it, don't babysit it!
Hey, did your roommate hit that girl last night? No, they just stayed up giggle fucking all night.
To be struck with an incessant laughing/giggle fit that keeps going on and on at inconvenient times, rendering you fucked because now you look weird.
Person 1: *sitting in a classroom which is currently silent then happens to think of a funnyline from Pineapple Express that strikes a chord* AhahahahahahahahaHAHAHAbuah! *clutching stomach, tears streaming down face, trying to be quiet but failing*