The act of masturbating at an extremely inappropriate time, with littlerespect for the feelings of others in the vicinity
John: Bob, we're at a fucking funeral, stop jerking off in the corner!
Bob: Why? Masturbation is perfectly healthy!
John: That's not masturbation, that's crassturbation.
Bob What's that?
John: Look it up on Urban Dictionary.
the act of taking a crap while masterbating to save time computer nerds do it most often while taking a break from WOW or halo or any other of that stupid shit
marvintook a break to crapsterbate after four solid hours of unreal tournament