1) High self-esteem, whether justified or otherwise, leading one to score with the ladies
2) Cocky sexual attitude; to be certain one is going to get laid
Example:
Friend 1: "Man, I can't believe Joe is talking to that girl. She's way out of his league."
Friend 2: "Yeah, he's in utter dickbelief!"
3) A newly-found faith in a friend previously thought to be a loser; being impressed by a friend's sexual conquests.
Example:
Friend 1: "Wow! Did you hear Joey took those two girls home from the club and had a threesome all night?!"
Friend 2: "Yeah. He's restored my dickbelief in him..."
Friend 1: "I guess I'm a dickbeliever, too! What a lucky bastard!"
1) After three crown and cokes, Nick gained a bit of dickbelief and flirted with the sorority sluts.
2) After Morty scored with that bombshell, I was in dickbelief.
See also: Dickbeliever ; Romeovernight