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1. When you are borrowing something or stealing something from someone and you tell them
2. When you grab something in a sneaky manner (used as "thief")
1. I'm thiefin you're computer, man
2. Did you just see Alena thief that chair?
thiefin by Kailyn Schmidt November 1, 2007
(thēv-in) .v.

: the act of taking something from another, whether it be the theft of time, items/possessions, and people in which one may be involved in any form of relationship with.
Chelsea stole my idea. She straight thievin!
How are you going to just take his girl like that? Straight thievin, you have no loyalty.
Thievin by Tom_Atoe February 5, 2014

Thievin’ Steven 

The act, during a cornhole game, of “accidentally” miscounting the score in your own favor.
“Wait, wait . . . You only have 12, not 13. Don’t pull a ThievinSteven.”

thief in chief

The President of the United States, during these benighted times as America slips from moral leadership of the Free World into kleptocratic collectivism. (Derived from the appellation "commander-in-chief", reserved the the leader of the nation.)
"There isn't one bum in the race worth voting for. All they want to be is 'Thief in Chief'. Every one of 'em is a lying crook hoping the taxpayers still have a coin to squeeze before the nation collapses into insolvency."
thief in chief by Honeyko August 4, 2016

Thief in Chief

Another increasingly popular nickname for the 45th POTUS.
With a larcenous track record as long as his, it seems entirely likely that the Thief in Chief will attempt to steal the 2020 Election.
Thief in Chief by Dr Bunnygirl June 11, 2020

thiefing 

Stole internet services thanks to poor protection system of the victim
Thiefing wireless ADSL internet access of a neighbour
thiefing by MaxKawa November 2, 2007