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This is a variant of the Teabag in which one dips their nut sack into a lady's (or if you are gay, a guy's) mouth.

The Musty Teabag is when you reverse it positioning your anus directly onto the recipients nose whilst you dip your nuts into the recipients mouth.
Just as she was beginning to suck my nuts I turned around 180 degrees and gave her a musty teabag.
by VicThrust June 21, 2007