Abbreviation for Grub It From The Back. Generally used to describe the act of oral sex on a female in the doggy style position. Commonly associated with women who are posteriorely endowed. If a chick has a bony ass and you GIFTB, you could get a black eye.

Also used in hashtag form on Twitter or IG pics denoting a desire to perform such act on the woman depicted.
Example: @ibellaan #GIFTB

Example: "Oh man, that chick has a fat ass... I'd grub that from the back!"
by Okjosue May 22, 2014
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