Top Definition
middle finger salute, one finger salute, Trudeau salute
The middle finger, often displayed alone as a gesture to indicate anger or contempt. Named after the Ontario Highway 401 on which it is regularly used.
1. That idiot driver cut me off, so I gave him my 401 finger.

2. When landmarking for CPR, find the xiphoid process and mark it with your 401 finger.
by seren November 02, 2004
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