slucking
when you masturbate without porn and someone walks in so you put your dick inside your pants while your cumming. The person then sees an expanding wet spot on your crotch. The excuse that follows is called slucking.
Person 1:Dude my mom walking n on me beatin my meat so I said that I spilled my water
Person 2: How are you so good at slucking?
Person 2: How are you so good at slucking?