Top Definition
When a woman is undoubtedly flattered by a charming man, she experiences the symptoms of Marathonitis. Symptoms include uncontrollable smiling, giggling, nervousness, and many similar feelings related to flirting. There is no cure for Marathonitis. Once you have acquired Marathonitis, there is no turning back.
Boy: You look adorable this evening Kitty!
Girl: *blushes* Thanks Puppy :)
Boy: I think you just caught the Marathonitis ;)
by Christaky December 29, 2011

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