No shame if you didnt know. But means you wouldnt have been able to tell the girls where to find you.
"The term upriver (or upstream) refers to the direction towards the source of the river, i.e. against the direction of flow. Likewise, the term downriver (or downstream) describes the direction towards the mouth of the river, in which the current flows. The term left bank refers to the left bank in the direction of flow, right bank to the right.".
"Lefty loosie" [bank on left side while traveling in direction of water leaving river]
"Righty tightie" [bank on left side while traveling against direction of water leaving river]
Somewhat applicable saying is for right handed [common] thread bolts:
When nut is traveling in a direction on thread of the nut entering onto the bolt - turn to right if looking up the bolt - turn to left if looking down the bolt.
When nut is traveling in a direction on thread of the nut leaving off the bolt - turn to left if looking up the bolt - turn to right if looking down the bolt.
For river water: IMO... saying up stream and down stream works best for most peoples' understanding.
For bolts: IMO... saying tighten and loosen works best for most peoples' understanding.
Just felt like rambling this eve!