Something that makes you happy in the pants, thought not necessarily in a sexual way. Sometimes, though, it IS in a sexual way. Other times it's just because you're happy.
"When I saw him pass, it just make my poontang quiver!" (Sexual)

OR!

"Thank you for those chocolate chip cookies! They made my poontang quiver." (Just plain happy.)
by Marf December 10, 2003
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