To put forth more effort. Often said as encouragement. Commonly used in Hong Kong by people who are bilingual, the phrase is a loan translation (calque) of the Cantonese phrase ?? (Jiayóu). We could hear the fans screaming at us to add oil as the time on the clock dwindled. Add oil, go, go! Yay! Good job!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.