Friendasaurus 

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."

Friendasaurus by nutman November 23, 2004

Friendasaurus 

There is always an obligatory "fat" friend in any group of hot girls... the Friendasaurus!

Look at the bloody Friendasaurus in that group!!

Friendasaurus by imnotasthinkasyoudrunkiam October 23, 2008

Friendasaurus 

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.

Friendasaurus by the brown bear October 10, 2008

friendasaur 

The ugly fat girl (ie Land Monster) that is inevitably best friends with a group of attractive females, or sometimes, the attractive female you are trying to have intercourse with. Like an NFL lineman, she will do anything she can to prevent you from attaining your goal. More often than not, the only way to get past this seemingly unpenetrable defense is to have a friend (prefereably a land monster slayer), hook up with the friendasaur. Much like a soldier in combat, one loyal slayer must jump on this perverbial grenade for the benefit of the whole battalion.

Guy #1: I really want to take Lauren home tonight, but you gotta help me out with that friendasaur next to her.
Guy #2: Buy me 3 more whiskey shots and I'll slay her good.

friendasaur by James "Weenah" Carter June 27, 2006

friendasauras 

The Ugly (often fat) Friend Who Tags along to run protection for the hot or cute ones in the group.

Alurah is the friendasauras for her group when they hang out

friendasauras by guyver November 24, 2006