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5.
A doer is somebody that you would have sex with.

Background: People used to commonly refer to the sex act as "doing it." Then they'd say things like, "I did her," "I'm gonna do him tonight," Etc. Hence someone that you would or could do, is a doer.
She ain't a ten, but she's definately a doer
by Bill G March 28, 2005
 
1.
Someone who gets stuff done. Obviously.
A: We need to get these documents edited, proofed, printed, and mailed by next week!
B: Call Joe. He's a doer.
by Pollyflopadopolous June 13, 2010
 
2.
1. Two people (or any other creatures capable of having sex) that often engage in the act of sexual intercourse with each other.

Originating from a conversation on bullshit feminist literature (The Awakening, A Doll's House) in Ms. Winkle's 3rd period AP Literature class on Thursday, January 19th, 2012, between Alec Luis and Raamis Hussein.

2. Uptight people who get shit done...
1Ex. Raamis: "Dude, they have lots of sex..."

Alec: "ya, they must be "do-ers"".

Both: HAHAHAHAHAHA!

Raamis: "Dude that's awesome!"

Alec: "Hell ya, Im gonna enter that shit on Urban Dictionary"!

2Ex. "He gets his shit done..."

"Ya, he's a real do-er..."

"Yes he is, but he's also a virgin..."

ahahahahahahaahahah
by Muchograndeeeaa January 20, 2012
 
3.
A person who acts accordingly to what is should be done, completed. A person who's willing to make it better. A person who makes it real.
Don't be a Don't-er, do be a Do-er!
(Pain&Gain)
by UDGoogler September 17, 2013
 
4.
Used By Canadians, especially in the area of Niagara, to describe a smoking apparatus used for smoking pot. And yes, it is as Retarded as it sounds.
I got some weed man, who has a Doer?
by dosmildolares October 25, 2006
 
6.
The act of raping doing someone under an overpass.
"Hey Katie look at that sexy beast!"

"Mmmm...I'd doers him"
by KCCCHT August 23, 2008