Top Definition
The theory that the human population is kept in check by bats. Bats eat the excess children, slowing the rate at which the world's population takes up all space available on the planet. Thanks to bats, humans can survive on this planet a little longer.
The quote, "20 Million kids are eaten by bats every second," by Penny Arcade succinctly defines Bat Theory.
by Naivan January 04, 2010
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