Top Definition
one who does not understand when everyone else does
The bostrich missed the exam even though it was written on the board.
by rhymeswithostrich June 16, 2011
A cross between a bitch and on ostrich.
I thought that chick was a postrich, but after talking to her, I can tell she's a complete bostrich.
by joshjordan October 31, 2011
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