Phoebe: In the cab on the way over, Steve blazed up a doobie.
Phoebe: Smoked a joint... y'know, lit a bone, weed, hemp, ganja.
Rachel: Okay, okay, okay, okay, okay. I know. Okay, I'm with you Cheech.
This was a reference to Cheech Marin, an American comedian and actor, who gained recognition in the Cheech and Chong "stoner" movies of the 1980's.