Grammatical Rule of Thumb

1.Using "he" in a sentence as the default pronoun(instead of "he or she") for someone of an unknown gender,a person using this rule is thus considered a sexist by feminists.
2. Rule that compares such a person previously described to that of a wife-beater(wife beating is where the Rule of Thumb part originates).

My feminist English teacher yelled at me about my use of the Grammatical Rule of Thumb in my English paper.

by Klausmetzger January 11, 2009

The Rule of Thumb

The teenage act of using your thumb as a hole guide for your cock which is larger than she is used to. After slapping your fumbling dick in your palm, you gently insert your thumb into her pussy. Like Houdini you simply run your cock along your thumb, using it like a ruler or a guide, to direct and allow an easy and simple access’s to an otherwise unsatisfied pussy.

She was too tight for me, it was dark and I couldn’t even find her hole
properly. I heard Jimmy strolled in last night at the pub and after a few drinks he took her home. Apparently he used “the rule of thumb” his old
Man taught him. After a while the crafty fucker worked his huge knob to the hilt - and we didn’t see him for 3 days!

by Jungle Diver August 1, 2019

Rule of thumbnail

A rule of thumbnail is a principle that is not intended to be strictly accurate or reliable for every situation. It is an easily learned and easily applied procedure for approximately calculating or determining if a Facebook profile is worth clicking on based on it's thumbnail.

Guy 1: Have you seen that chick's face?
Guy 2: No, i thought she wasn't worth looking at, according to my rule of thumbnail.

by starterel March 21, 2013