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30.
It means to french kiss with someone. It falls from french kiss to french to french's which is a popular brand of mustard.
Friend: Did you get to mustard today?
Friend of: Nope
Friend: Why?
Friend of: too many peoeple around
 
1.
As in good, not as food but naming or calling something 'mustard' means this is good.
'Last Night Was Mustard'
'That Game Was Mustard'
by SM66 November 07, 2007
 
2.
Good, Pleasing to oneself, exciting
That's fair mustard innit bruv.
by Jimbo Jet Set October 23, 2003
 
3.
Another slang word for money, similar to 'cheese'.
"...Friends want to leave when they see you outta mustard..."
-Lil Wayne
by JoSé February 18, 2005
 
4.
A tangy sauce often put on hotdogs and hamburgers. Called mustard because it is in fact the same color as mustard
Hand me the bottle of mustard please
by Habeus February 17, 2005
 
5.
British slang, originating from Pilsley, Derbyshire: A weak expletive which shares both its definition and conventions of use with the word bastard. Originally, "mustard" was used to refer to a child born out of wedlock, but through a process of semantic broadening, it is now mostly used as a general pejorative term. It can be used both as a noun (see example one) and an adjectival intensifier (see example two). The word bastard is used in precisely the same way. As an antidote to your ignorance, other examples of intensifiers are: fucking, bloody, chuffing, sodding, etc.
Example one: My phone's such a mustard; the autocorrect feature has made a fool of me yet again.

Example two: Arghh, my mustard phone has caused me ridicule!
by Coconut Noggin. February 10, 2012
 
6.
otherwise known as mus-tard. combination between muslim and tard. Derogatory term towards muslims, which is often used as a joke rather than a serious insult.
L: Stop being such a twat you mustard
H: runs away and cries or lols
by noodow4ever July 26, 2010
 
7.
A derogatory term for any homosexual of Hispanic descent - especially Mexican - or those who very closely associate with such persons.
I walked in on Juan and Pedro last night - the mental image of those passionate mustards will haunt me until my dying days...
by Golgomath May 09, 2010