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2.
Excellent or awesome. The "-ner" suffix makes fun of Southern California surfer slang.
Dude, you that board is sickner!
by Ethan Fassett May 23, 2008
 
1.
A word Irish people use to show their acknowledgment that something bad happened.
Séan - ""My girlfriend just broke up with me!"
Patrick - "Sickner!"

Sinéad - "I was walking down the street then I fell in front of everybody!"
Siobhán - "Sickner for ya!"
by sophiesoph August 04, 2008