going Riker 

growing a beard, from scratch. also, when you cause a situation that destroys or seriously injures the starship Enterprise, NCC-1701D.

"Nice beard."

"Thanks dude, I'm going Riker."

going Riker by Hamtron5000 January 5, 2009

Going up the River Thames

Anal sex whilst the receiving partner is suffering a bout of diarrhoea.

Jonathan 'jay-kay' Kell Going up the river Thames
4 minutes ago via Text message · Comment · Like

Going up the River Thames by falolout August 4, 2010

Going down the river Thames 

When you are having sexual intercourse and your partner has an urgent diarrhea, which he/she cant hold and lets go. But being the brave man that you are, you ignore the obstacle and keep on doing what you love the most... (no pun intended)

Bro, me and my sis totally went down the river Thames last night.
Going down the river Thames is my lifestyle.

Going down the river Thames by Sir Gregory Thames January 30, 2016

Goin' across the river 

Derived from a scene in Chapter 7 of the World War I novel "All Quiet on the Western Front" by Erich Remarque, the term "goin' across the river" means to have sex, as the three main characters must cross a river to visit French whores.

Courtney: Yo Tyler! Goin' across the river tonight?
Tyler: Heck yeah, we're going on a band trip!

Goin' across the river by Katczinsky the Awesome Guy April 21, 2009