2 definitions by AGS

1
An affirmative statement or acknowledgement of information.
A jovial retort.

Roots, if they must be traced, are archaic and are in reference to one's "baby maker" (that you are putting your mouth near it/on it).
One is so much in agreement with the other person that they would preform oral sex with each other.

Not a threat, although new mothers don't favor this term. Use discretion with your slang.
The negative form is also easy to use:

"I am NOT biting your baby".

Other forms exist such as:
"I'm gnawing your toddler"
"Chomping your child."

Used usually to add variety by those that are already familiar with "biting your baby".
Drew: I'm having a barbecue on Saturday.
Tyson: What are you grilling?
Drew: Steak and corn on the cob.
Tyson: I'm biting your baby! I'll be there.

Drew: Tonight Ingrid and I are going out to the movies, do you want to come?
Ian: I'm biting your baby, but I've got to work on this script. Thanks, though.

Jayson: Do you want to hang out at my house?
Drew: So I can watch you play Wii? I am not biting your baby.
by AGS June 14, 2007
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2
A holiday where you work towards achieving your dreams, noted my many to be on March 4th "March Forth".

This holiday is used as an excuse to make an effort, take a risk, or refuse to let reasons come between you and your goals.
On March Fourth (March 4th), people make a special effort to improve their lives, improve themselves and "March Forth" toward their dreams and highest aspirations.

Some examples:
Anything you DO that makes you feel good!
Reading a book by an author you aspire to write like.
Writing 2 pages/entries/edits on that thing you've been working on.
Taking extra time to express love for your friends and family.
Calling a record-high number of clients, and asking for sales.
Taking the stairs to your floor or walking to the next bus stop.
by AGS March 08, 2011
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