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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
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