When a dog wags his or her tail, hence their butt is happy.
I could tell my dog was happy to see me because she had a happy butt.
by happybuttdog January 10, 2011
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When things are going well for you.
An extra little bounce in your step.
A really good mood.
Sally: "You're in a good mood today!"
Dave: "I woke up with a good dose of happy butt!"
by jsd9632 January 12, 2012
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An offer you simply cannot refuse to give up.
"Want to go eat some shrimp at that one restaurant you like?"
"Well that sounds like a Slap-Happy Butt-Smackin' Deal, my good sir!"
by Cyrus9201 October 11, 2013
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When you're incredibly happy about something.
So happy in fact, that your enthusiasm could easily be perceived by others as you being gay for said object of affection.

Butt happy is the antithesis of being butt hurt.
Mikey was all butt happy when he heard that Tool was playing a show in downtown Austin.
by Psych091 May 9, 2011
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