Jeroentje 

Training a skill in osrs with little to no effort.

OMG, you have 99 cooking! Awesome! You just pulled off a Jeroentje!

Jeroentje by Cumplug October 9, 2017

Joentje 

a creature that likes to steal girlfriends from their boyfriends

oh god take cover its joentje again hunting for new girls that have a relationship he will destroy it!

Joentje by dannny February 1, 2005