Top Definition
The unfortunate and embarassing cramp like pain 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"
by Baby fill it up January 16, 2012

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