def. An especially unattractive member of an otherwise good-looking group of socializing females.

Addendum: Also sometimes known as the "Fat Friend," one will observe that the Friendasaurus is sober and apparently PMSing, which aids in her dual roles of the outing; being the DD for the group, and as the Grandmaster Cockblocker, foiling any attempts for an eventual sexual encounter with one of the more attractive ladies of the group.
Guy1: "Dude, 2 O'clock, the redhead, she's STUPID hot!"

Guy2: "Yeah, but you see the nasty chick dancing next to her? She's a major Friendasaurus; I just saw her cockblock that guy in the green shirt."
by nutman November 23, 2004
There is always an obligatory "fat" friend in any group of hot girls... the Friendasaurus!
Look at the bloody Friendasaurus in that group!!
by imnotasthinkasyoudrunkiam September 10, 2008
When an attractive girl has a surprisingly unattractive friend that always hangs around providing a constant living cock block for all men trying to make a play.
I was about to spit some game on this chick but her Friendasaurus was always on the prowl.
by the brown bear August 14, 2008

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