cadger : One who goes about begging or getting his living by questionable means.

I've known and used the words cadge and cadger ...well... forever!
To cadge means to get what you want sneakily. For instance the guy who shows up at your house *every* Sunday just as dinner is being served and says something like "Oh, gee but that smells good. I haven't had a bite to eat all day." Of course he must - for politeness sake - be invited to dine with you. That's cadging and he is a cadger.
The female cadger is the one who puts you in an awkward position with statements like : "I'm wearing my blue suit to a very important meeting where I must impress the boss. You know, that sapphire pin of yours would really make the outfit." Grrrrr.
The answer to the last is, of course : "Sorry, but I gave it away last Christmas!"
You cannot say "I've already loaned it to someone." because the cadger will want to know who, when it's due back, ....see what I mean? They just put you in very difficult position where it's nearly impossible not to be really rude! That's the cadger.

Maybe we could have a thread on really good excuses not to do some(any)things!