Bitch, you talking to a grown ass man
It’s like, way-way-way too much up in your pants
For us not to make the bed squeak

from Big Sean (Ft. Kanye West & Roscoe Dash) – Marvin & Chardonnay Lyrics on Rap Genius

Meaning

The bit about him being a “grown ass man” has a double meaning here. He is too old and mature to have people telling him to talk to the hand like in the first line of this verse, but he is also a grown “ass man”… hence the line of “[having] way way way too much up in [her] pants for [them] not to make the bed squeak.”

In other words, her ass is too fat/phat to resist…

(Notice the pause, and the bed squeaking, before proceeding to the next explanation.)

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