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1.
Originating from the EPIC border collie dog's name, owned by the Lord and Lady Parker of Leicestershire, England.

Mosschops is overly excitable, impossible to photograph, and tends to let out a small wee if he particularly likes you.
He got so excited, he did a Mosschops in his pants!

Running around like a Mosschops

Mosschops is epic!
by xpz393 April 27, 2011
 
2.
A girl / boy who has greenery in their teeth gaps!
Cor Blimey, have you seen her Moss Chops, has she heard of floss?
by Dee.Dee April 12, 2010