doesn't/wouldn't know (one's) ass from (one's) elbow(redirected from doesn't know his ass from his elbow)
?Note: This page may contain content that is offensive or inappropriate for some readers.
doesn't/wouldn't know (one's) ass from (one's) elbow
rude slang Is very stupid or dimwitted. I'm not surprised to hear that she got lost two blocks away from her house—she doesn't know her ass from her elbow.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.