Niagra Canoe

When a girl is sucking off a guy and the guy throws up on the girls back.

I totally Niagra Canoed my girlfriend after eating bad sushi last night.

Niagraing

The process of allowing semen to spill from one mouth to another at a distance.

verb : Niagraed - My boyfriend niagraed me by letting my semen spill from his mouth into my mouth while looking down at me.

I love niagraing my boyfriend by spilling his semen back into his mouth from above.
My boyfriend loves to be niagraed; he loves the feeling of my semen cascading into his open mouth.