Green’s Dictionary of Slang

(orig. US) to move over, to squash up; often as scooch over.

1965–70		in DARE.
1985		O. Hawkins Chili 56: I scooched close.
1997		Eble Campus Sl. Apr. 7: scooch – move close together: ‘We could fit one more person on this sofa if everyone would scooch together’.
2006		S. McKelden Venus Envy 214: Hannah sat down on the edge of the couch beside me. ‘Scooch over.’.
2021		J. Ellroy Widespread Panic 109: Babs scooched down and swung her legs up.