1 definition by tunasub_backwards
the friend that you bring with you to a hangout as a "third wheel" when you're unsure if the hangout is platonic or romantic in nature.
"This guy asked me to hangout but I don't know if he meant it as a date. I need you to be my spare tire so it's clear we're just friends." "Can you be my spare tire?"
by tunasub_backwards February 7, 2022