An approximate way of doing something based on presumptions rather than fact. Contrary to popular belief, the idea the law once allowed a husband to beat his wife as long as the device was no thicker than his thumb is false, as such assaults were outlawed for centuries in common law, although the ban wasn't generally codified in written law until the 1980s.
A driver kept going 5 mph over the speed limit, thinking the police had a rule of thumb that it was a waste of time to give out a ticket to anyone going anything lower than that.
by BlastFurnace February 27, 2025

by CowsAndPigd April 11, 2022

by fearjam January 30, 2019

The cramp on the palm of the hand at the inner base of the thumb caused from manually grinding weed. A weed writers cramp.
by ccroni3 October 31, 2014

by Syafie October 18, 2022

by Not Guitarist Ryan May 20, 2021

by cumslider February 1, 2024
