What you get when a transsexual
male tucks, tapes, or lashes his penis back sandwiching it between his legs. This word is where the affectionate term for a large meaty sandwich originiates, i.e. to have a lot of meat tucked between two buns.
Jason was about to hook up with a hot chick from the club but luckily as (s)he bent down he spotted her tranwich and quickly bolted.