When a man has a hypothetical boner for another man. i.e. mancrush. This does not mean that the man is actually sexually attracted to men, just that if he were attracted to one, a certain man would be it.
Dude: I'm can't chill, I'm going to the gym with Alex.
Chick: I figured, you've got a total manboner for him.
Dude: Shut up.
Dude, do you always have to be so damn obnoxious? You're such a manboy!
Damnit, I get carded everywhere I go, Must be because I look like such a manboy.
A kid usually around the age of 8 who already is getting attention from all the girls. Puts the other boys to shame. A kid that makes you say Damn he's winning
Micheals brother was a ManBoy winning when he hosted his 9th birthday and 80 percent of the guest were females
The sexual act of a woman getting behind a man, on her knees, pulling his weiner through his legs (gonzo or goat style) and performing oral sexfrom behind.
The actual word for what Mike Epps was talking about in Friday After Next!