We found one dictionary that defines the word can't tell arse from elbow:

Miscellaneous (1 matching dictionary)

1. can't tell arse from elbow: Idioms

▸ Words similar to can't tell arse from elbow ▸ Usage examples for can't tell arse from elbow ▸ Idioms related to can't tell arse from elbow ▸ Wikipedia articles (New!) ▸ Words that often appear near can't tell arse from elbow ▸ Rhymes of can't tell arse from elbow ▸ Invented words related to can't tell arse from elbow