M.O. 

Abbreviation for Modus Operandi which means a method of operating or functioning or a person's manner of working.

The M.O. of the serial killer was leaving a red rose on the body of his victims.

M.O. by Bonafide25 May 17, 2006

m/o

is sort for make out or making out.

" Omg, last night me and bill were m/o until my parents came home...it was so fun"

m/o by madelyn alexis September 23, 2005

M.O. 

Adj.
Short for Method of operation. Latin form "Modus expeditione." Meaning what one certain person is most noted for. A certain look, way of doing things or even attitude.

There is no latin word operandi

Stan: "who do i know that likes drinking and hates zombies?"
Nate: "Man, drinking and hating zombies?! Add pirates and thats my M.O."

M.O. by Andrew Von Doom September 26, 2005

M.O. 

Method of Operation

Tianna's M.O. is always go in, be an annoying little bitch, walk out, and watch everyone hate her.

M.O. by MyMotherCanRotInHell March 12, 2010

M.O

short term for: make-out

He's such a m.o whore.
Me and Jessica had a m.o session.
I'm the m.o king.

M.O by Jakeeeeeee December 20, 2007

M.O

these letters stand for the word movement

wat's the M.O for 2day?

M.O by JEMIKA July 30, 2006

M.O. 

Your fucking code and creed. How you do it.

That kid STAYS banging fat chicks. That's his M.O.

M.O. by J-junk January 13, 2006