How do you celebrate a nice made putt? Or anything for that matter?
Fist pump? "Hand" Gun? The Chi-Chi Rodriguez?
Personally, I try my hardest to keep a straight face, stroll nonchalantly to the cup, pick the ball out of the hole and give my imaginary gallery a quick wave. (Hence my quote-thingy under my avatar.)
...It sounds kind of douchey when I write it down...He he.