Green’s Dictionary of Slang

ground-hog n.2

1. (US) a caisson worker, working under compressed air, digging and laying the foundations of bridges etc.

[US]Morn. Tulsa Dly World (OK) 13 June 19/1: Dingbat — A laborer; known also as a shovel flirt or stiff or groundhog.
[US]N. Klein ‘Hobo Lingo’ in AS I:12 651: Ground hogs—men who work in compressed air at caisson work.
[US]Howsley Argot: Dict. of Und. Sl.
[US]Monteleone Criminal Sl. (rev. edn).

2. (Can.) a meteorologist.

[UK]Partridge DSUE (8th edn) 507/2: since ca. 1969.

SE in slang uses

In compounds

groundhog case (n.) [image of the trapped animal]

(US, Western) a tight corner, an inescapable situation.

[US]A. Garcia Tough Trip Through Paradise (1977) 105: I [...] hated the job of going after the horses. It was a ground-hog case.
[US]C.A. Siringo Texas Cow Boy (1950) 78: It was [...] dangerous to cross. But the wagons being over made it a ground hog case—or at least we thought so.
[US]DN III 231: Ground-hog case [...] An unavoidable situation.
[US]A. Adams Wells Brothers 🌐 Ch. vi: It’s a ground-hog case; it’s hold these cattle or the Indians will eat them for you.
[US] ‘Animal Comparisons in Indiana’ AS II:1 52/2: Groundhog case—‘An extreme case’.
groundhog juice (n.)

(US) rough,cheap whiskey.

[US]Witchita Dly Eagle (KS) 12 Sept. 4/4: There is a new name for the whiskey [...] ‘coyote milk’ [...] It has been known as ‘pizen,’ ‘sheep-dip,’ ‘squirrel whiskey,’ ‘white mule’ and ‘groundhog juice’.