A thumb thats exceedingly wide and short. Like a chode but its a thumb, hence chumb. See Megan Fox's thumbs for an example!!
A: OMG look at her thumb its so wide and short!! Who has thumbs like that??
B: Oh yeah she's got a chumb!!
B: Oh yeah she's got a chumb!!
by Sickskier1 March 6, 2011
Get the chumb mug.chumbs up!
by Jon Queerbeck February 19, 2012
Get the chumbs mug.by Kaila Mayo April 28, 2008
Get the chumbe mug.by Pineapplesjee April 5, 2019
Get the Blueberry chumb pot mug.