An unfortunate affliciton of the neck and spine for both women and men which is contracted via the rhythmic motion of "giving head", hence causing "head ache"
Oh man, according to Danny Sessions, Chat Dodds couldn't have left that party without severe "head ache". You know....because of all the gobbies.
Similar to Bed Count. One's Head count is the number of times you've gone down on someone, performed oral sex. Many people believe that oral sex doesn't count as a full notch on your belt, so Head Count is adjusted as Fractional Sex.
Kim: "Well, add one to my head count. I just went down on David in the back seat of his car. I guess I'm up to 15 now."
Krista: "Well, that's fractional sex, so it only counts as 10, especially if you didn't swallow."
Kim: "I swallow every time."
Krista: "Okay, 12.5 then."