Derived from the common mispelling of 'the'.
1. The non-existant malady that one cathces by being around homosexuals (males especially).
2. Term used mostly by those denegrating anti-homosexual positions of religious leaders and far-right wing politicians.
"Yo, John went to San Fransisco and caught 'teh gay'!"
"The Governor wants to prohibit homosexual couples from being foster kids? He must think they'll catch 'teh gay' or something! LOL!"