triple-click

Short definition from Wiktionary

Noun

1. 1
   The action of pushing the button on a mouse three times in quick succession in order to perform a different task that would be performed from a single-click or double-click.

Verb

1. 1
   To push the button on a mouse three times in quick succession in order to perform a different task that would be performed from a single-click or double-click.