(CLAIM FIRST), bagsy [verb] [T] [UK and ANZ] [informal] - (used esp. by children) to have the right to have or do (something) because you say you want it firstI bagsed it first! (= I said I wanted it first so I should have it, not you.)"Who wants to go first?" "Bags me! (= I want to.)"Bags I sit in the front seat! (= I said I wanted to do it first, so I should do it, not you.)See also bag (OBTAIN).
BAGS
Meaning of BAGS in English
Cambridge English vocab. Кембриджский английский словарь. 2012