A cumgasm piss-fuck is a sexual act where one guyawakens a sleeping dude, by dick-slapping him across his face, and then fucks his mouth making him the early bird who gets the worm, has a cumgasm, and then pisses in his mouth and makes him swallow it all.
A fleshlight cum-rush cumgasm is the stoned on Maui Wowie, popper-bating, kind of orgasm a guy has when he masturbates with a fleshlight like I'm going to do tonight.