We found one dictionary that defines the word be a pain in the backside:

Miscellaneous (1 matching dictionary)

1. be a pain in the backside: Idioms

▸ Words similar to be a pain in the backside ▸ Usage examples for be a pain in the backside ▸ Idioms related to be a pain in the backside ▸ Wikipedia articles (New!) ▸ Words that often appear near be a pain in the backside ▸ Rhymes of be a pain in the backside ▸ Invented words related to be a pain in the backside