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A "Tuck-back" is when a male (or a female with a cock and balls) tucks their cock and balls backwards behind their legs leaving only pubic hair showing so it appears that they have a hairy vagina or a mangina.
"Wow did you see him pull that "Tuck-back" I thought he was a he/she"
by KING BAKER OF THE V REALM September 04, 2009