making a float
... is when you piss into a girls mouth, and then, while she holds the urine in her open mouth you, her, or a third party jerk you off until you cum into the pool of piss she is holding in her awaiting mouth.

Called a float for short, it is named such because it resembles a yellower version of the ice cream floats we all loved as children.

p.s. it is important that the piss be in collected and waiting in her mouth before the semen arrives!

It is preferable that she swallow the float. Waste not want not!
me: You won't believe this, but she let me make a float last night!
friend: No way! I had no idea she was down for making floats!
me: Absolutely! And, she drank it too! She must have been thirsty!
friend: Are you making a float again tonight?
me: Yep, she said she can't get enough!