A term of endearment, used by a man or a woman, in reference to their partner, after the man ejaculates either inside of or over the other's anus. Also, can be used as a derogatory term for gay men, but only rarely, and in jest amongst straight men, who are feigning 'gayness' for the amusement of friends and/or family.
Gay guy #1: 'Hey there, slippery-tail, how'd you like that last bung-load?'
Gay guy #2: 'Ohhhhh, marvelous, my jizzy-boy, thanks kindly, when may I have another?'
Gay guy #1: 'Hold your horses there, humpy-buns, I gotta reload and do some more coke.
Used in the Brony Fandom, train of My Little Pony cosplayers
Hey man, let me finish my horse elixir drink and then I'll join that pony tail.
when you pull the toilet paper roll out (with out ripping it off the roll), wipe, and leave the soiled toilet paper hanging from the receptacle.
Dude, you left a nasty donkey tail.
The completely unexpected - but most welcomed! - brief moment of witnessing a sneaky glimpse of a girl's white panties e.g. when exiting a car in a short skirt.
"Keith, Keith, did you just clock that bitch's rabbit's tail?!"
An attractive woman that may or may not have sex with you.
Jerry has been hitting up all the bars. He is definitely out looking for some tail tonight.
having good anal sex with clothes on.
Ron gives better tail than you.