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1.loser
2.friendly yet annoying
A term used for a social and academic loser who, in a desperate attempt to re-gain popularity, befriends an individual to the near point of stalking them.
dave is a cling-on. Get him away from me
cling-on by sunscreen July 3, 2005
This is when a guy takes a bitch home from the club to smash and the bitch ends up stay over for days instead of just a few hours.
Damn Rob, I can't believe you are inviting the Cling-on over again. How many days is she going to stay this time?
Cling-on by Devious Tuning February 11, 2009
When you take a shit and shit sticks to, or "clings on" to the bowl.
I flushed the toilet but there's a piece of shit that don't wanna go. I call that shit a cling-on
Cling-on by bow2ursensai September 4, 2016

cling on 

little pieces of faeculent matter that get caught in hair whilst defaecating. Usually in men with particularly hairy arses.
I took a very relaxing dump, but spent a while cleaning up due to the presence of multiple cling ons that arose.
cling on by wharf May 16, 2006

Cling on 

When a female starts talking to a guy and is instantly obsessed with him. goes to all means to attach herself to him. multple phone calls and text messages may occur till she knows exactly what he is doing.
olesia is cling on to him like a fat kid loves cake.
Cling on by *whiteside September 30, 2007

cling on 

That little booger that gets stuck in your nose and you can't get it out.
Kels had that cling on for a week!
cling on by S Fizzy August 18, 2009