1 definition by Pescados666

Term used for having sex in a popular MMORPG known as RuneScape. This sex can be homosexual, heterosexual or even beastly.
Guy 1: I just had a Jansen.
Guy 2: Hmm... Sounds fun.
Guy 1: Why don't we do this right now?!
Guy 2: I'll get my laptop!
Guy 1: I have my Iphone so I can do this 2, 3, 20 times a day!
by Pescados666 October 28, 2007
Get the jansen mug.