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
face!!
Jeez, Heidi, you let me use that
stank trampkin without saying anything!