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1.
JMJ
Jesus Mary Joseph

Instead of saying OMG (Oh My God!) all the time when surprised...
"JMJ...I don't believe this"
by Frog123 July 06, 2006
 
2.
JMJ
Jam Master Jay
The DJ From RUN-DMC, one of the best hip-hop groups of all time
kid 1:Who are the best old school DJs?
kid 2: There's Flash, Kool Herc and Premo of course... but no one can spin it like JMJ
by Flave May 08, 2004
 
3.
JMJ
in dutch
when some 1 asks u: everything is good?
ur saying ja met jou (in dutch)
or by short: JMJ

or whens he asks u: alles goed?
ur saying jmj.
Person #1: " yo, Everything is good?
Person #2: "JMJ?
by Farranush July 11, 2010
 
4.
jmj
jmj is an abbriviaton for juggle my junk

as in come shake my penis
hey i just got done peeing come jmj
by this guyyy February 05, 2011