We found one dictionary that defines the word mothereffing:

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1. mothereffing: Wiktionary

Definitions from Wiktionary (mothereffing) ▸ adjective:  (minced oath) Motherfucking. ▸ Words similar to mothereffing ▸ Usage examples for mothereffing ▸ Idioms related to mothereffing ▸ Wikipedia articles (New!) ▸ Popular nouns described by mothereffing ▸ Words that often appear near mothereffing ▸ Rhymes of mothereffing ▸ Invented words related to mothereffing