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1.
1. A deep, profound lonliness that can only be filled by the company of a member of the opposite sex.

2. The period after the end of a relationship when the person(s) are tired of being alone
Guy1: Man, its been 2 months since she broke up with me and i got singleitis

Guy2: Dang, that sucks...
by Consanguine June 24, 2009
 
2.
Singleitis is a condition where it is impossible for you to be single for a long period of time and you must have a boyfriend/girlfriend otherwise you go crazy. it is a rare condition and few people have it but those who do find it very hard not to have a boyfriend or girlfriend for long periods of time
Dude ive got singleitis, i cant handle not being in a relationship.
by ghatts1son November 18, 2010