full throttle

Short definition from Wiktionary

Noun

1. 1
   A maximum setting on an engine or motor control: especially, the totally open position of a valve for air intake, but also any corresponding maximum setting.
2. 2
   A maximum level of speed, effort, or risk.
3. 3
   Alternative form of full throttle.

Adverb

1. 1
   All out; at maximum speed, effort, or risk.
2. 2
   Alternative form of full throttle.