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The runny liquid substance that comes out of the mustard bottle before the actual mustard if you don't shake it well before use.
I went to put mustard on my hotdog and all I got was this fuckin musquirt.
Musquirt by treflip666 November 8, 2006
Related Words
The extra "mustard-water" that comes from a bottle of mustard when it's not properly shaken.
Person 1: "Dude my hotdog bun is ruined!"

Person 2: "why?"

Person 1: "Because, I forgot to shake up the mustard bottle and now my all-American-snack is completely soaked in musquirt!"........."Ewwwwwwwwwey!"
Musquirt by Stevenoni January 21, 2008
The watery yellow drizzle that sprays out of an empty French's mustard bottle.
"Damn, a musquirt! Soggy buns again!"
Musquirt by V. E. Reyes September 21, 2008

McSquirts 

Extensive diarrhea after the consumption of McDonalds.
Shit, stop the car, I just ate a Big Mac from McDonalds and now I have the McSquirts!!
McSquirts by AD87 September 8, 2008

Mcsquirter

The feeling you get after eating too much fast food.
Crikey, i feel a right Mcsquirter coming on.
Mcsquirter by TheHoon May 15, 2009

Mcsquirt 

The result of many of Mcdonald's menu items. Similar to a Mcdump but much runnier.
Man that Big Mac really gave me the Mcsquirts.
Mcsquirt by all i need is one child September 18, 2010