eat (someone's) ass out(redirected from eat their ass out)
eat (someone's) ass out
1. rude slang To vehemently or furiously scold or reprimand someone, especially in the military. The captain ate my ass out after I came back to the barracks drunk.
2. vulgar slang To sexually stimulate someone's anus with one's mouth.
eat someone's ass out
Rebuke or scold harshly, as in Watch it or the sergeant will eat your ass out. This expression became wide-spread especially in the armed forces. [ Vulgar slang; c. 1940]