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1.
1. Noun: Referred to as the 'The Prime Rib'; equivalent definition to the phrase 'the illest'; "the bees knees"

2a. However, can be used as an adjective in which 'prime rib' refers to something that is 'cool, tight, or sweet/distinctively awesome'. Synonyms include: dope, crack, fresh

2b. In any situation, derivation of phrase can be used.
Esp. to describe a female's admirable characteristics.
Just bought a leather toilet seat; that shit is the prime rib.

*No other examples are necessary.*
by Dr. Douchebag January 25, 2011
17 0
 
2.
Something that is cool and/or awesome and/or great.
Dude, did you see that flip he did? That was so Prime Rib!

If you can get those photos that would be Prime Rib.
by X3LA July 29, 2008
24 10
 
3.
A Synonym of the word "dank". Usually used when referring to some really really nice buds or "chronic".
"Dammnn mang, that Cali Kush is Prime-Rib!"
by Doda Dreje January 24, 2010
4 0
 
4.
the act of taking a humongus shit and then having ur girl stick her arm up your ass then make that bitch lick it off
it was really kinky one night so i told my girl to do a prime rib
by jeremyteddychris November 11, 2003
7 60