However my bigger dictionary does not dare to give a translation, just a definition: ojék (J) bicycle or motorcycle put to use as an inexpensive means of hired transportation; the passenger sits behind the driver and is driven to his destination for a fee. This definition includes non-motorised bicycles.
Ojek is what you take when you're too cool for angkot, or need to get somewhere quickly.
They've modernised the ojek service in the past few years too. You can get GO-JEK! Which is like Uber for ojek hahaha
You can check out the app's website here if you are interested:
I was going to add that last time I was in Indonesia (July) Go-jek had rocketted in popularity and has branched out similarly to Uber, offering Food delivery and various other types of delivery services.
Gojek and the Singaporean Grab were so popular that it seemed traditional taxis roaming the streets (in Bandung in particular) had all but disappeared.