2 definitions by zac sutherland
The word utilized by caucasians in the scientific community when they realize that their 10 years in graduate school went down the shitter and they have no fucking clue what they're talking about but they still want to sound smart. Comparitive to conjecture, speculate, or hypothesize. This term is basically the honkey's way of saying "guess" while still maintaining a know-it-all air about themselves.
"I may be going out on a limb, but I will make a rational assumption and say that in 20 years there will not be a single white NBA player left because they are all afraid of Lebron James's big black cobra."
by zac sutherland June 17, 2008
To be hit across the cheek with an enormous black cock, sometimes equal to the force of that asteroid that wiped out the dinosaurs (the one that white people make rational assumptions about and are most likely to be the recipients of suck a cockslap).
"Melvin is such a whitey, i wonder if his lifesyle would change as a result of an enormous black cockslap?"
by zac sutherland June 17, 2008