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.
Charles: "Hey, where's Jamal?"
Tito: "Man he's just sitting home chubbin on his ex."
By Elvina
Chubbin'
the act of being extremely annoying or stupid while being fat at the same time; stupidity, retardness, slow, dumb.
I told Billy to stop CHUBBIN' when he was running around screaming that the sky was falling.
I'm loving Chubbins's attempt at insulting me with the name of the mysterious poster in the definition below. Personally, I think my insulting post was much better.
Hugh: "Don't you think Chubbins is a bit of a knob?"