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1.
Something so thrilling that you feel it in the pit of your stomach and your anus puckers up, too.
Have you ever gone skydiving? It's a real buttpucker!
by Mica M November 21, 2007
 
2.
an extreme tight ass, excessively anal
You have so much butt pucker you might suck yourself in.
by babblepfish September 28, 2006
 
3.
When a wet butt hole breathes and loosens up before it is fucked.

When the hole is so relaxed it is open for fucking
Will you please pucker your butt so I can insert myself into it? ;)
by Timothy Tool July 11, 2004