A kino escalation technique, sliding a hand inside a girl's pants to feel her arse. Traditionally this must be done early in the encounter, well before such an action would normally be considered acceptable. Therefore, it is a high risk strategy to be used with care.
"Have you seen Ron's black eye? He tried the Oval Manoeuvre on a bird at the bar last night and she nearly knocked him out!"
"Did you hear about Dave's new bird? He walked up to this total hardbody at the bar and pulled the Oval Manoeuvre. She loved it and couldn't get him home fast enough!"