1
general::
Phrase(s): scoot over
to slide sideways while seated. • Scoot over and let me sit down. • If you scoot over, we can get another person in this row.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Move to the side, especially to make room. For example, If you scoot over a little I'll have room to sit down. [Colloquial; first half of 1900s]
American Heritage Idioms