A shirt with spunk stains (usually the result of a masturbatory session when tissues or toilet paper were out of reach) that a guy knowingly wears out in public.
Harry thought he could get away with wearing his squirt shirt to the company picnic, but it was a plain white t-shirt, and the cum stains were clearly visible to his boss and co-workers.
by noodles montgomery October 19, 2009
When a man ejaculates, most often from jerkin his gherkin, and he shoots some man muck, most often by accident, onto his shirt.
Bill Clinton was renowned for walking the halls of the oral office with a little collateral shirt squirt on his outfit.
by Jimmy Dink March 22, 2017