Green’s Dictionary of Slang

information that brings the listener up to date.

1951		R. Starnes Grant’s Tomb 7: ‘Now [...] give me a six hundred word fill-in on what’s with you these last eleven years’.
1959		C. Himes Crazy Kill 44: Now just give me a quick fill-in on Val and Dulcy.
1975		Sepe & Telano Cop Team 83: That was all the fill-in D’Amico needed.
2021		J. Ellroy Widespread Panic 15: ‘Give me fill-in’.