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JMS is used mainly on the internet, and is simply an abbreviation for 'Just Making Sure'.
Noob1: Hey, make me a sammich.

Noob2: Did you say you wanted me to make you a sammich?

Noob1: Yeah.

Noob2: Alright, JMS.
by DoraTheRapist August 11, 2010
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Mostly used on IM programs, is stands for "just making sure"
D-Ray: "Homey, we still down for the movies, right?"

Eddie Guerrero: "Si!"

D-Ray: "jms"
by The Edgecator March 05, 2005
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JACKING MY STEEZ, and exclamation used when niggaz be on ur threads
that foo be straight JMS, jacking my steez
by I am the boss December 22, 2009
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Jewish Mother Syndrome; to be really overprotective, grouchy, and an overall bitch; PMSing
Omigosh, my mom has a serious case of JMS! She won't let me go to the movies tonight because she said that I could get raped and kidnapped.

...also....

That girl- Arielle- is SO jms...who shoved a stick up her butt?
by dirrtyyJEW December 14, 2005
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JUGGALO MOB SQUAD 916 OP

oak park nigga!

you roll wit da JMS?

hell yeah!

down wit da clown 4 life!
by lette4life[OP] March 27, 2008
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JMS is Constantinople. (from song Istanbul is Constantinople)
He is also a man of many songs.
An Arabian chant, a jungle yell, "dum dum dum JMS bites the dust", "JMS dum dum dum ftl", "OMG JMS", etc.
SUPERMAN THAT (J|M|S)!

JMS is Constantinople! JMS is Constantinople! JMS is Constantinople!
by chrick January 24, 2008
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