Adj, primarily used as interj. Excellent, i.e. like sex in terms of excellence. Need not refer to a sexualexperience.
1. "Dude, my little bro is visiting relatives so we can throw the party at my place."
"Sexcellent! I'll be right over with the kegs.
2. "That was some sexcellent paralell parking. You will pass your drivers test even if they blindfold you."