A verb used by only the finest of virgins. Implies that the sex they are about to have is so good that there isn't a chance than just the word "sex" or "fuck" can cover the intense emotions and sensations they'll be feeling during the act.
Alex Jinghoff: So, you gonna have sex with that hotty Bessy?
Caden Mitchell: Heck yeah man! We're gonna have so much fricking sexfuck while playing Lego Star Wars that even "sex" and "fuck" can't describe the kinky crud we'll be up to! UwU