Green’s Dictionary of Slang

toast v.1

1. (US) to subject to an interrogation, to pressurize.

[US]R. Starnes Another Mug for the Bier 23: One [table] is reserved for the reporters and the other is used by the committee staff and whatever witness the committee happens to be toasting.

2. to kill, to shoot dead.

[US](con. 1962) J. Ellroy Enchanters 141: Woo-woo. Motel Mike toasts four beaners [...] and it goes to his head.