To politely beg for something, to get something off someone.
Someone who is generally a fool, failure, an idiot or a very annoying person, i.e a scrounge, a scrounger.
To describe something that has gone delightfully wrong or to describe something tasty, i.e scroungelicious, scroungificent or scroungic.
"Scrounge as much ammunition as you can, the guys back at the base could give you some."
"That guy over there is such a scrounger, all he does is shout at people all day long."
"That was abseloutely scroungic!"