Top Definition
A creature that thinks it's half fish and half pig and likes to be inexplicably rolled around the floor in satin pyjamas.
A merpig typically wakes after a night of drinking, flexes its frotters, squeals and then organises a series of high powered events for a major art gallery.
"Seen the merpig lately?"
"Yeah, we went for a few drinks and then she withdrew into a sleeping bag oinking and wriggling her snout."
by GuyS September 27, 2006
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