I'm rolling up and let the contact get him

from Tech N9ne (Ft. B.o.B & Wiz Khalifa) – See Me Lyrics on Rap Genius

Meaning

A contact high is a psychological phenomenon that occurs in otherwise sober people who come into contact with someone who is under the influence of drugs. It involves a supposed transfer of the physiological state of intoxication.

But more often people refer to second hand smoke as contact high.

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