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Smo, this word is from the old and nearly forgotten stoke dialect that used to be spoken in and around stoke-on-trent. It means small boy.
"Hey there's a smo"
"How's your smo?"
smo by Taffy69 September 21, 2005
an abbreviation of the popular phrase "Suck Me Off" the word SMO can be used in many different contexts.
As a verb: "SMO me real quick bitch"
As a noun: "Gimme a SMO!"
As an Adjective: "That girl looks like a real SMObag"
a slurred term made up of smut and ho, other related words include: prostitue, whore, hooker, slut..etc.
"That girl just fucked ten guys in a row, what a smo!"
Smo by li5463 December 28, 2005
acronym: suck me off.

common uses: retorts, commands for hoochies, and playful banter.
Police Officer: Your license and registration please...
Neil: SMO!
SMO by Neil F. December 11, 2008
S = Spontaneous M = Math O = Orgasm

An acronym used for a(n) math teacher randomly taking a liking to relatively difficult mathamatic equations/problems.
2a+4b=8 *Moans* "Thats a hot binomial!" Thus obtaining an SMO.
SMO by Jozsef Kali January 24, 2008
Slightly-Morbid-Observation. Used in place of lol (laugh-out-loud), when some form of humour is intended, but laughter would obviously be inappropriate.
Person A: Oh man, that test just absolutely killed me.
Person B: Me too, it really deserved to be written today on 06/06 at 6 o'clock. SMO.
Person A: Good call man, good call.
SMO by Shaun McKenna December 29, 2007
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