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Comical corruption of "fuckin' tremendous!". Used for fun, or when use of the actual phrase out loud would be inappropriate.
"You missed last night's piss-up, man! Oh, meckin' tre-FUN-dous!!!"

or

"Whoa, your new girlfriend has one meckin' trefundous ass, dude."
by Uncle Al, the Perv's Pal July 29, 2005
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