Sintendo 

n.

Sexual intercourse.

"... we were playing Sintendo in the back seat of my mum's car..."

Sintendo by Jason Gregory January 13, 2008

sinuendo 

An indirect sexual reference or implication that violates the boundaries commonly viewed as appropriate inuendo or discourse.

Dude, that bitch boss of yours made some wack sinuendos at the holiday party!

sinuendo by christine sixteen August 19, 2009