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1.
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.
by trwaszk June 12, 2011
 
2.
A line of the drug cocaine.
Guy 1: "Hey, what are you doing right now?"
Guy 2: "Just getting ready to blow a chalker."
by Srinivasan January 17, 2007
 
3.
A fat piece of human lard
Dat fine ass bitch is 'bout to deal with a "chalker"!
by YizBeck July 06, 2011
 
4.
A term used for a horrible player on a hockey team.
The guy who's so bad the coach will scratch him just to count the score, shots, hits etc. on a chalkboard. In the worst case, a chalker will be chosen even when the team has 5 or less usable players.
Guy 1:I'm moving from this team, they never play me
Guy 2: No shit they never play you, you're the chalker.
Guy 1: yea well i heard the chalker on the other team got cut! I'm there.
by Mazz46 April 08, 2009
 
5.
someone who uses chalk as an artistic medium ...can be on a chalkboard, brick wall or sidewalk...
"Daddy, you are a good chalker!"
by Emmydoodle March 22, 2010
 
6.
In Surfer speak: Someone who wears an all black wetsuit and has an all white surfboard.
Dude, what a total chalker...
by kmn December 13, 2005