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1.
Is a fairly common problem where people experience ‘obsessions’, recurring unwanted thoughts which are difficult to stop, and ‘compulsions’, rituals of checking behaviour or repetitive actions which are carried out in an attempt to relieve the thoughts.
Jocelyn has obsessive compulsive disorder, and checks the door 16 times to make sure it is locked.
by Barizzy January 26, 2006
 
2.
To be so absolutely obsessed with a person that one talks about this person in everything that one does.
Man, Steven Keating has obsessive compulsive disorder, he is so in love with that girl that he talks about her in every conversation and shes even in his clan tag.
by OmgDanIsTheHottestManAlive March 28, 2010
 
3.
Disoder in which the sufferer has a 'need' to have everything perfected to the 't'. They are usually very anal and will induce bodily harm should you ruin their arrangements.
Ah, all my vinyls are arranged from A to Z...WHO THE FUCK PUT PINK FLOYD IN THE Z's?!!!"
by Sai Wolf May 29, 2005