A discarded napkin already used by a bum/tramp/dero in McDonalds. For it to qualify as a trampkin, you have
to use it to clean your hands or mouth
by mistake (or on purpose).
That's not mine... it belonged
to that bum who was sitting across the table. Gross, you just used a trampkin on your
Jeez, Heidi, you let me use that stank trampkin without saying anything!