When your constipated and have to take a huge chunky shit.
"Man I havn't shit in 5 days, its time for a chunky dunky"
by JakeSAUCE September 18, 2006
An alternative to skinny dipping for people with high BMIs.
I don't skinny dip, do you wanna chunky dunky?
by nklatt August 30, 2010