Top Definition
being so feral and disgusting at the same time doing things that a mongrel often does in a horrible but funny way, often while on the piss/ getting para/ getting fucked up
'what are you up to you filthy human?’

'im just mongrelating...’

‘fuck your one seedy prick, im keen to mongrelate later on at that party’.
by keith-gary December 19, 2010
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