1. overboost - Noun
2. overboost - Verb
overboost (third-person singular simple present overboosts, present participle overboosting, simple past and past participle overboosted)
To increase an engine's intake manifold pressure to higher levels than it is designed for.
(uncountable) The process of overboosting.
(countable) An instance of overboosting.
Source: en.wiktionary.org