Oh, is that absurd? You thought we was all just some nerds
Man you must be out your rabbit ass mind
If you think we don't keep them thumpers

from XV – Stone Cold (3:16) Lyrics on Rap Genius

Meaning

Did you really think they they couldn’t rap? If so you’re outta your rabbit ass mind or in other words, you’re wrong. Because XV considers himself quite the rapper, saying he has thumpers or dope songs.

thumpers is wordplay off the previous line about a rabbit ass mind because of the fictional character thumper in the disney movie bambi.

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