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MO-ing is short for Making.Out.

It can be used in the following ways: Mo'ing, we Mo'ed, or just Mo.

#1-Yo swat, so tell me why this one chick was tryin to MO in my car lastnight.

#2-I was mo'ing with like 4 honeys last night son. it was crazy.

#3-David cant get no girl. He hasnt even Mo'ed wit a honey before.
by Holy!...and swat.. December 02, 2008
the present action of making out. (verb)
Emily: OMG, did you MO with that salsa dancer last night?

Jill: Yeah, we were MOing all night long.
by Jeff Crocenzi December 17, 2007