To shut ones mouth as demanded by another.Used especially well when someone is talking out of their ass. For added effect it goes well in almost a sing-song type usage.
chup-chup-chup your mouth, chupchupchup your mouth!
Hey greg you don't know anything so chup boy!
For the sing-song usage just drag out the U and bring it up an octave in the middle, then back down at the end: chuuuuuUUUUuuuuuuup.
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