1. someone is trying to suck up to someone for example, laughing at a joke that really isnt funny.
2. Someone asks for money to go and buy someone or asks for someones food
3. Someone who spends time around someone and really fancies them and is completely undignifies about it.
2. "Stop begging it off him for cash you trampy whore, leave him alone and get your own you tramp."
3. "Allow begging it off him, you blatently fancy him"
"Oh my days, why are you begging it? Those animals wouldn't hurt a fly!"
This can be used widely, if a guy texts you alot you would say they are begging it. If someone sets a facebook status asking people to talk to them, they too are begging it.
Used mostly between teenagers and in the UK begging it can be literally added on to anything just for the laugh.