
Definition funny of Yesm:
This is a short form of 'Yes ma'am'. When used to a guy, it is a slight and unnoticed insult. Very good for an annoying boss.
Your mother: "Get your ass working now!" You: "Yes'm." Your boss: "Get your ass working now!" You: ( snickering ) "Yes'm."
A shortened version of yes ma'am, much like yessum, though it's even shorter than that. Used by them lazy folk who dang can nay type no good.
one syllable, similar to "ism" basically "yes", originally a shortening of "yes ma'am" but gradually becoming used in almost all contexts in which yes is used.
"Hey you there?" "Yesm"
Yesm brought about by shortening Yes ma'am or yes Man. Also a typographical error. The M Is next to the comma.

Books about Yesm:
Yes'm by J. M. Duke (Oct 25, 2012)
Yes'm [Paperback] [2012] (Author) J. M. Duke (2012)

Wiki information Yesm:
Yesmail Interactive, an infogroup company, is an email marketing solutions provider headquartered in Portland, Oregon and has offices in San Francisco, Los Angeles, New York, Chicago, Boston, Atlanta, Omaha, Toronto, London and Singapore.