Where one lesbian is determined to turn a straight person gay, this is in an obvious way that the other person is clearly aware of.
It is often used among joking conversation as an insult between females.
An acute condition in which a straight girl turns lesbian. This condition can last from several days to several years but will resolve spontaneously on its own; no intervention required.
"Did Mary really leave Jane for a man? Weren't they together for almost 10 years?"
"Ya, turns out Mary just had a really long case of lesbianitis."