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An abbreviation for Turtle Neck. Turtle Neck being a way to refer to a man's genitals as being uncircumcised.

The foreskin of an uncircumcised penis resembles the neck region of a Turtle Neck sweater.
Did you see that old man's Trtl Nek in the shower. Man that shit was disgusting!
by The Trtl Nek'r December 29, 2010
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