max out

Short definition from Wiktionary

Verb

1. 1
   To reach the limit of one's capabilities.
2. 2
   To reach a maximum or a point at which no more growth or improvement is possible.
3. 3
   To use (something) to the limit of its capabilities.
4. 4
   To relax.
5. 5
   To serve an entire sentence with no early parole, time off for good behavior, etc.