When someone purposely turns his/her bck on the certain someone that has been there for them in more ways than one. Supported taught cared for Just so they would or could make themselves look better or be important.
You stepped on my toes for a come up after everything I have done for you, didnt ur momma tell you , dont bite the hand that feeds you.
Another term used for "backstabbing", but especially referring to a subordinate individual that attempts to combat, or retaliate against, the powers that make/made him what he is.
"Osama Bin Laden tried to bite the hand that fed him by destroying the WTC (supposedly the CIA trained Osama for a Soviet invasion against Afghanistan). He'll pay for that, to say the least."
-me