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When an individual with a cold sore (herpes simplex B) claims to have a "sun or fever" blister when it is obviously a cold sore. They are "hepatratin'."
Example 1:

Becky: "OMG! I was at the beach this weekend and I got this sun blister." Jody: "Girl, stop herpatratin'! You and I both know that's a cold sore."

Example 2:
"Can I have drink?"
"Hell no! You're herpatratin'!"
by woogienutts August 17, 2012
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