The literal definition for ass-cheese is the sweaty, smelly grime that can be found between the butt cheeks of an unwashed crack, more often found at the very beginnings of the cavity just below the rump.
Other definitions include the use of the word describing things and/or situations equally foul or smelly.
Ass-cheese can be used in replacement of similar words that describe things and conditions that are unfavorable.
The resultant fecal protrusion as result of fighting off the imminent need to defecate, that has moved beyond the turtle head stage. Ambulatory movement while in this state results in the subsequent movement of the Ass Crayon, thus creating a abstract expressionistic piece of art on the inside of the persons underwear.
Not wanting to crap in the pub's gnarly toilet, Drew knew his wiggling Ass Crayon would make quite a masterpiece as he waddled his way home.
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"