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1.
To swallow from two sources at the same time.
"Did you see her twallow those two bottles of beer?"
"Yeah, she is an amazing twallower!"
by Nocandosville Baby Doll! November 09, 2013
 
2.
When a girl is fingering herself using sex toys and her pussy ends up swallowing it.
"She told me that she was fingering herself with a dildo, then her pussy went to Twallow it."
by PaPa ZiTT & Silent Killa November 30, 2006