Krypter
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"Krypter" is one Colonial equivalent of the "mayday" distress call.
In the Miniseries, Captain Lee Adama loses power to his Viper Mark II after he lures away and destroys a Cylon missile inbound for the civilian transport Colonial Heavy 798. The blast of the missile that he shoots down strikes Adama's Viper and damages his power systems or other avionics needed for navigation.
Adama sends out a mayday call to Colonial Heavy 798 prefixed by, "Krypter, krypter, krypter..."
If a pilot must eject from his fighter (typically in a combat situation), the mayday call used may be "drifter" instead.