Slang meanings of "nails"

[Beefstrogan]

English Language Tests, Intermediate level

ESL/EFL Test #367 "English Slang Idioms (88)", question 1

"Wipe that ......... expression off your face, private! You can't leave the base this weekend due to the field exercise and that's it! Suck it up and drive on," the platoon sergeant said to a forlorn Private Gonzales.

(a) excited
(b) satiated
(c) headstrong
(d) hangdog

English Language Tests, Intermediate level

ESL/EFL Test #367 "English Slang Idioms (88)", answer 1

"Wipe that hangdog expression off your face, private! You can't leave the base this weekend due to the field exercise and that's it! Suck it up and drive on," the platoon sergeant said to a forlorn Private Gonzales.

Correct answer: (d) hangdog
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what are slang meanings of "nails"?

Beefstrogan

[Mister Micawber]

HERE are some, but the Urban Dictionary is not always trustworthy.
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Native English teacher at Mister Micawber's