C'mon toots, give me the Valium alley-oop
I'll slam dunk it in your mouth 'til you puke

from Eminem – Same Song & Dance Lyrics on Rap Genius

Meaning

Hes going to force her to take it until she pukes, and he refers to basketball in a pun, she tosses it to him like an alley-oop, and he slam dunks it in her mouth, like after an alley oop

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