A type of person that watches and interferes with the business of others (but only selectively picking on a few individuals). A common way of doing this is through jabbing; a beady spreads negativity and feelings of worthlessness through these jabs.
A beady thinks he knows it all (he especially thinks he has a special insight into the workings of those individuals he picks on), and his opinions are fixed on everything (however wrong).
"Beady said I should have snogged her, although he said I wouldn't have got anywhere anyway"
Beady been jabbing- "Well, you certainly enjoy your food don't you?"
"You looked f*cked mate"
"Well, it's the closest any of you boys are gonna get to pulling this weekend"
"Very funny, but you obviously have too much time on your hands"
"You should have snogged her... although you wouldn't have got very far anyway"