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Three on the tree 

A manual transmission with 3 gears and reverse, that is located on the steering column. This is the most common transmission on vehicles from the late 1930s through the late 1960's, but could be found on vehicles as late as the 1980's.
My grandpa's 1963 Plymouth Belvedere wagon had a three on the tree.
Three on the tree by Snake 429 January 9, 2018

three on the tree 

having a three speed transmission where the shifter is actually located on the column. seen in 60s model fords.

Three on the 21

In reference to Trisomy 21 where there is 3 genetic materials on the 21st chromosome instead of the usual 2. This causes Down's Syndrome.
He never really understnads what is happening.I think he's a little 3 on the 21. Started in Canada in 2004.
Three on the 21 by Jennica Starlight November 30, 2004

three on the tree 

when u have three drink bitches on your cock. happens mainly in college settings
yo i had three on the tree, they sucked the shit out of me
three on the tree by rod thorn June 19, 2003

three on the tree 

Meaning to have an original-style car with a manual transmission with six different gears in the follwing shape:

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A.K.A Three on the tree.
The original poster is incorrect.
My 1987 Subaru Bratt 4x4 is three-on-the-tree, man!

Three on two

Also called the porn star. Three men on two women.
There's a three on two... oh, you mean the porn star. No an odd-man rush... yeah, a porn star. Duh.....
Three on two by Big Bud X2 April 26, 2025