To hound or pursue something or someone with a usually malicious intent.
Derived from the use of a bird dog to hunt game.
Apparently mistaken by
millennials as a slang hybrid of 'bird' being female, and 'dogging' being the act of cuckolding or sharing of one's wife willingly or unwillingly, whilst obviously overlooking the actual normal every day meaning of the term
to the point it irritated me to make a bloody account on here to set things straight. So upvote this
definition so these low life tweens can at least use the term correctly.