sick

via metafilter, token sucking:

The criminal carefully jams the token slot with a matchbook or a gum wrapper and waits for a would-be rider to plunk a token down. The token plunker bangs against the locked turnstile and walks away in frustration. Then from the shadows, the token sucker appears like a vampire, quickly sealing his lips over the token slot, inhaling powerfully and producing his prize: a $1.50 token, hard earned and obviously badly needed.
...deterrence, when dealing with someone willing to clamp his mouth to one of the most public surfaces in all of New York City, was next to impossible.
...one token sucker acknowledged the depths of his desperation. "Hard times makes you do it," he explained, adding: "Anyways, I've kissed women that's worse."