As defined by Roger's Profanisaurus, a 'zig-a-zig-ahh' is to have a really good wank to a Spice Girls video.
Tony Blair: "Keep my seat, Gordon, I'm off for a quick zig-a-zig-ahh back in the office."
Gordon Brown: "Don't be long!"
Tony Blair: "I never am!"
The sport that only very cool or stupid people do that involves running and then jumping of the side of a cliff or object. After having a wild fall downwards the person pulls their parachute hoping that it opens. If not they die.
<some boy> hey girl did you see steve on the news?
<some girl>no, what happened?
<some boy> he went to argentina and died base jumping
<some girl>ahh, i told him to zig when he thought he should zag