A deceptive technique used by Thai transvestites. The act is comprised of "tucking" ones genitalia between ones legs so as to resemble the female counterpart.
Tourist #1: "I met this gorgeous girl last night at the bar."
Tourist #2: "So, did you end up banging her?"
Tourist #1: "Well, once I got her back to my place I discovered she was pulling the 'Thai tuck' all night."
Tourist #2: "So, did you end up banging him?"