Mo

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late 19th century: abbreviation of moment.


Ety img mo.png

wiktionary

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From Middle English mo, from Old English mā, from Proto-Germanic *maiz, from a comparative form of Proto-Indo-European *meh₂-. Cognate with Swedish mer, Danish mer; and with Irish mó, Albanian më. See also more, most.

Abbreviation of month.

Clipping of  moment. 
Clipping of  homo, itself a short form of  homosexual. 
Pronunciation spelling of  more. as pronounced in  non-rhotic dialects, notably  African American Vernacular English. Only coincidentally similar to sense 1 above. Compare  fo'(“for; four”),  ho(“whore”). 

Short for moustache.

Clipping.

From mil, by analogy with do and gro.


etymonline

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mo

representing African-American vernacular pronunciation of more, by 1902; it was an acceptable variant form of more in the Middle Ages and has roots in Old English; see more.