To chub or chubbin is the process of becoming erect in response to a positive stimulus such as "sexy story" in a back alley.
Hey Brian, Last night I made love to my wife and I had the greatest sex, we 69'ed and she kept the change, oh I'm chubbin.
by Gordo2007 July 19, 2007

by tommeh! April 14, 2008

by beth davies June 14, 2008

by bb3345 March 13, 2016

by dragondreams4u June 05, 2017

by Sandy W. February 26, 2008

Chubbin is a slang term for the emotional post-relationship feeling that you get after losing a girlfriend. The act of dwelling on how much you miss the relationship or significant other.
by Cliggs March 16, 2013
