moocher

Reader's Digest 9月号の人生相談コーナー、Ask Auntyからです。
I have a couple of friends who are moochers. When we go out for dinner, I end up with more than my fair share of the bill and the entire tip as well.
文脈からして "moocher" はケチもしくはたかり屋の様ですが辞書で確認します。
・Wiktionary: A person having a tendency to repeatedly ask help of others, especially if they are making little effort
・WordNet 1.7 Vocabulary Helper: to help themselves. Usually used as a pejorative. moocher, mooch, cadger, scrounger -- (someone who mooches or cadges (tries to get something free))
"moocher" としては掲載していない辞書も多く、原形の "mooch" ならどの辞書にも説明があります。
・Compact Oxford English Dictionary:
1. [no object] (mooch about/around) British loiter in a bored or listless manner: he just mooched about his bedsit
2 [with object] North American ask for or obtain (something) without paying for it: a bunch of your friends will show up, mooching food
・Dictionary.com:
1.to borrow (a small item or amount) without intending to return or repay it.
2.to get or take without paying or at another's expense; sponge: He always mooches cigarettes.
"mooch/moocher" は米語で、英国では "cadge"/"cadger" の方を使うようです。