Welcome Longwell, re:(slang) a person who avoids responsibility and effort; loafer; slacker.

there is also the feather term, used in UK, and someone there will have to get it right for me..
"Wearing a white feather" or "taking a white feather"-- i have heard the idiom, and i know it is used to describe young men who failed to enlist in the armed services (at a time of war) fast enough to suit some people. the meaning at it mildest was slacker, at it worst, coward.

i don' t think is was ever used this side of the pond.