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1.
The fever symptoms (chills, lesions, muscle ache, etc) associated with the body's removal of toxins after exposure to them.
Ugh, I feel terrible; I must be coming down with something.

Dude, STFU and quit getting all herxheimer on me. You know you banged that skanky assed syphilitic whore last night and are just paying the price for it this morning.
by That Fat Guy with VD July 11, 2011