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1.
A below average penis, or small penis
When he pulled down his boxers it was obvious he had a smenis.
by Matt March 09, 2004
 
2.
the act of smothering with penis
When Johnnie pulled out his cock, Sally ran away in fear she might be smenised.
by Marcraine February 10, 2008
 
3.
abreviated term for "Smells like penis"
After Jon pulled his hand from inside his pants and raised it to his nose he said "Oh man! Smenis"
or
"Did you catch a whif of Dan's breath the other day? It was totally smenis"
by Bec April 14, 2005