If you want to sip get a paper water fountain glass
How I'm 'posed to know where your mouth been last
This is a callback to the lyric about Moet in the flask. One can infer that he is telling his girl (that he went to go do) that she needs to use a cup if she wants some because she’s loose and dirty and he doesn’t want to share a drinking container with her.
He’s telling the teacher to get a paper cup if she wants some of whats in his flask. Basically this whole part is like hes trying to leave school cause his girl his home alone, and the teacher was like give me some of that Moet and you can go
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