When a dog wags their tail too much against a hard surface, resulting in a bloody-tipped tail. It is common in shelter animals.
I was at the shelter and this dog was super excited to see so many people that it ended up with happy tail.
by coolclaire75 December 8, 2015
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1. The condition of someone who's had great sex the night before. Often endured (barely) by coworkers and friends. Always accompanied by a smile nothing will wipe off.

2. Adjective to describe a racecar experiencing severe oversteer or looseness. A loose racecar's back wheels tend to head for the outside of the track in a corner. Hence, the tail is merrily out of control and trying to spin the car out.
1. Bob's girlfriend is back in town. I suppose he'll be tail happy all day long. Makes ya wanna puke, doesn't it?

2. Dale Earnhardt, Jr., is downright tail happy coming out of turn 3. He's gonna slap the wall if he isn't careful.
by wordguy2 March 16, 2010
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A blue cat who is the companion of Natsu Dragneel. He can summon wings from his back and fly around. Similar to Natsu, he is obsessed with food, specifically seafood. He is strong enough to carry Natsu as well, despite being much smaller than him.
"I cleared my mind of everything except for fish!" -Happy (Fairy Tail)
by CrystalJustice March 11, 2016
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