doesn't exist, if you mean "shit stain" or "turd/poop stain" it makes sense but your ass physically does not stain, if you use this word you're a moron.
"Damn I got an ass stain dude"
"You mean shit stain you idiot"
The unfortunate and embarassing cramp likepain felt in both buttocks after vigorous exercise. It can make it difficult and time-consuming to walk down stairs or slopes. Most cases respond well to conservative treatment.
"Will got Ass strain after running up the hill too many times, that's why it's taking him ages to walk down"
"Will won't stop complaining about his ass strain"
" Harry doesn't get ass strain as he does loads of squats at the gym, and is a well conditioned lad"
Spain's ass is a gift from the heavens! It is the best ass in the world. It don't matter if you think your ass is the best, no no. Spain's ass, is the best ass.
"Hey did you see that guys ass?"
"It was nice but it's no Spain's ass."