Early 19th century; earliest use found in John Brockett (bap. 1788, d. 1842), antiquary. Variant of maybe, with simplification of the diphthong of the first syllable.
Definition of mebbe in US English:
mebbe
adverbˈmɛbi
Regional informal
Maybe.
Origin
Early 19th century; earliest use found in John Brockett (bap. 1788, d. 1842), antiquary. Variant of maybe, with simplification of the diphthong of the first syllable.