Noun, Singular. Used to refer to two people or more (at even integers) who constantly do 'coupley' activities and seem to forget other people exist. Term can be used affectionally or as a slur
'Who's coming to the party?'
'Oh, Ted, Fred...and the Couple Monster'
A mythical creature said to live in a lake in Scotland. Keeps trying to get $3.50 from Chef's parents. Once dressed up as a Girl Scout to achieve said goal.
"No, you God damn Loch Ness Monsta, I ain't givin' you no three fitty!"
"Hey rick, have you seen that 'Wrath of the Monster' on Mike the Scientists channel?"
"No, what is it?"
"Oh just dumb kids doing a comedy skit for health class"