We found one dictionary that defines the word MTBer:

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1. MTBer: Wiktionary

Definitions from Wiktionary (MTBer) ▸ noun:  (cycling) A mountain biker. ▸ Words similar to MTBer ▸ Usage examples for MTBer ▸ Idioms related to MTBer ▸ Wikipedia articles (New!) ▸ Popular adjectives describing MTBer ▸ Words that often appear near MTBer ▸ Rhymes of MTBer ▸ Invented words related to MTBer