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1.
m7
A person who is just less than a mate (m8)
pronounced emm-sev-en
A What do u think of J?

B He's annoing, just a m7
by Ivan S February 27, 2008
 
2.
M7
Commonly thought of as mistakes on messenger services, however the terms are both equivalent to M8 - obviously an abbrieviation of the word "mate".
"oh hi there m7 LOL"
"hey m7, you cool you kerazy guy?"
etc etc
LARM
by David Larm July 10, 2008
 
3.
M7
Medication for men to treat Manginis. Usually delivered topically, but for serious and/or chronic cases there are maximum strength tablets, gel caps and capsules.
I think you need some M7, your Manginis is flaring up.
by CTJH May 05, 2011