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Double Chalker 

Someone with a circumference so wide that two pieces of chalk are required to draw their outline on the pavement.
Shit, the stiff's a double chalker. Lou, get on the phone to the fire department, we aint lifting him with our backs.
Double Chalker by the oob April 13, 2010

will chalker 

Male supermodel. Usually seen strutting the catwalks in Milan, Paris and New York. Hung like a donkey.
When will Will Chalker stop flaunting his willy?
will chalker by Gemma W December 14, 2008
Chalker is a fat person, specifically a girl. A girl is a Chalker when they are too big for you to wrap your arms around them when you hug them. In this situation you put pieces of chalk in your hands and mark down on the girl where your hands end. Then you would continue to the other side of the fat girl and put your hands where the chalk lines are, completing the hug.

Basically: A chalker is a fat girl that you can not fully wrap your arms around when you give them a hug.
Yo man i was at this party yesterday and Aunt Gertrude came... she is a Chalker man, i couldn't get my hands around past where her elbows would be.
Chalker by trwaszk December 10, 2011

shipyard chalker 

A man who ties up pieces of rope filling holes in a ship or boat. Along with this he puts a tar-like substance into the hole so the water doesn't leak in when more water pressure is added.
I hired a shipyard chalker to repair my boat yesterday.
1. A nerdy person, usually one who wears cargo shorts.
2. A white dad at a barbecue.
3. High school frat stars who wear grey New Balance shoes and calf high white socks.
"Bro that guy is such a chalker."
Chalker by poshmads September 28, 2015
A line of the drug cocaine.
Guy 1: "Hey, what are you doing right now?"
Guy 2: "Just getting ready to blow a chalker."
Chalker by Srinivasan January 19, 2007