Snipe, in woodworking, is a noticeably deeper cut on the leading and/or trailing end of a board after having passed through a thickness planer or jointer

Jointer

A jointer is a woodworking machine used to produce a flat surface along a board's length....

. Its cause, in a jointer, is an out-feed table which is set too low relative to the cutter head, or in a thickness planer an unnecessarily high setting of the anti-friction rollers of the in-feed table. The term has its origin in forestry where it is applied to a sloping surface or bevel cut on the fore end of a log to ease dragging. (OED)