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2.
in a harsh and pronounced way, severely
If you don't put on sunscreen before going outside bare chested, you'll get sunburned something fierce.
by Light Joker June 13, 2007
 
1.
Often added to the end of something to signify 'to a great degree'.
Dude, he was drunk something fierce last night.
This meat stinks something fierce, throw it out!
by Zero March 14, 2004