A cross-breed, can be a derogatory name for those of mixed heritage.
that mixed girl looks like a mongrel
by MixedRaceCutie October 9, 2006
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a rather unexplainable term used when you really dont like a person. marked by ugliness, rudeness, fatness, etc.
She is such a mongrel!
by mdoarngiaenlle November 2, 2008
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An annoying person who never shuts the fuck up and gives people their opinion when nobody fucking wants to hear it.
guy: wow could she have been anymore of an mongrel today.
guy 2: fuck tell me about it.
by rablerablerable May 29, 2011
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This term is a derogatory way of calling someone mixed-race.

It can be referring to when someone doesn't know what they are or are a percentage of every nation on the earth.

But, generally it means:

When someone is a mix of so many races that they're likened to a mixed-breed mutt.

i.e. a mixed-race person of more than two.
Dan: "Hey Mark, are you like French or English or what?"

Mark: "I'm a mongrel."
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The name given to a complete and utter nonce who scrounges around the Earth looking for someone to give them the smallest bit of attention. Tends to be spekky as fuck and claims to be class at maths when in reality they are mediocre at best.
Lauren: “Who’s that girl who’s just been added into our group?”
Jamie: “Oh, the one with four eyes? Thats just our mongrel.”
by megaweirdo January 22, 2019
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A knob in a state of high alert, viz a viz a watchdog or robber's cur. A less highly-strung version is known as a half-mongrel, or slung-mong.

Oaf: "By crikey, I'm so enamoured of that gentlelady that my mongrel is verily frothing at the mouth. I fear I shall soil my tweeds with nut muck!"
by Mr Marky January 31, 2008
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A knob in a state of high alert, viz a viz a watchdog or robber's cur. A slightly less prepared version is know as a half-mongrel, or slung-mong.
Oaf: "By crikey, I'm so enamoured of that gentlelady that my mongrel is verily frothing at the mouth. I fear I shall soil my tweeds with nut muck!"
by Mr Marky January 30, 2008
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