loop-the-loop

Short definition from Wiktionary

Noun

1. 1
   The manoeuvre performed by looping the loop.
2. 2
   A looped section of track, etc., as on a rollercoaster.
3. 3
   A yo-yo trick in which the yoyo is made to repeatedly swing around the hand in a looping fashion.

Verb

1. 1
   To perform any of several aerobatic manoeuvres in which the aircraft flies around a vertical circle.