to spit, to give up on, stop caring about, to be a piece of cake, to be very easy
Раз плюнуть.
A piece of cake.
— Подводная лодка (1981)
Может, плюнуть на все и согласиться.
Maybe I should just say to hell with it and agree.
— Legend No. 17 (2013)
Раз плюнуть!
A piece of cake!