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 31, 2008
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Someone who parties exessively hard at all times.
Dude, it's Mongrel Monday. Come down to the house and pound this keg-dog.

Dude, I was such a mongrel last night when I pounded all those brews/shots.
by Mongrelface McG April 23, 2010
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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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Anyone Conor determines to be a mongrel, or a little bitch
by ftl69 January 15, 2007
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An insulting way of pointing out someones mixed heritage. Also states that you think of someone as "having a lower status" than yourself.
You aren'tt even worth my attention, you goddamn Mongrel!
by Julius-Senpai January 17, 2019
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Anyone called Max, especially the basketball players
Ah you're such a mongrel Max!!
by Daniel998799871 June 24, 2018
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