A word which can be said to interrupt someone mid-explanation. If the explanation is really long, and tedious, then the listener can suddenly shout 'Beausejour', and the events which follow are at the shouters risk.
Alex: I find that x squared, minus the squared root of 2 raised to the power of 5 multip-

Matt: BEAUSEJOUR.
by Ashdo_Lover June 10, 2011

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