Another name for taking a shit. When a catcher in baseball wants his pitcher to throw a curve ball he puts down two fingers and since taking a shit is commonly referred to as "going number two" this phrase is appicable when you have to poop.
Man that coffee ran right through me. I got to go to the bathroom and throw a curve ball before I make a mess of myself.
After many months or years of a guy "helping" oneself, the penis begins to slightly tilt to one side when erect. Instead of being straight it angles off to the direction of the dominant hand.
He was OCD so his IrishCurve drove him crazy, he ended up cutting it off.
The moment when you take a turn on a moving vehicle and dramatically over-act the force of centripetal force to move closer/lean in to your. crush/significant other.
You took that opportunity curve quite sharply there, too bad she slapped you in the face...