Gen
1. As an abreviation of Agenda, can be used simply to ask whats going on, or what the plan is.

2. As an abreviation of Genuine, can be used to confirm the reliability of a statement, or in reply when asked if something is true.  For serious matters, it can be accompanied by the speaker's right fist applied upside down to the speaker's right temple, to avoid any doubt.
1. Whats the gen?  Whats the gen for friday night?

2. I just heard that tom had sex with his mum, gen.

Did tom really have sex with his mum?  Yeah, gen!