The skill required to keep yourself from prematurely ejaculating when having sex with a significant other.
Steve: So I was fucking my main bitch last night, and I was pretty nervous and scared that I'd blow my load.
Alan: What'd you do?
Steve: I just thought about rainbows and shit.
Alan: Whoa that must've taken tons of cumcentration.
Sophie: I have this jewish boyfriend, and he keeps prematurely ejaculating.
Oprah: Bitch you gotta send your man to a cumcentration camp.
Sohpie: Oprah, that's very socially insensitive, I dont make fun of you for being a queefopotamus, do I?
when a guy humps a girls butt without him or her having their clothes off. can also be done homo-sexualy.
jeff: "last night i was dry-bumming meleena all night long! it was insane!"
john: "wow but why didn't u guys just take your clothes off?"
jeff: "she didn't wanna have my dick up her ass"
john: "oh. i see.............."