The Collaborative International Dictionary
Marooning party
Maroon \Ma*roon"\, v. t. [imp. & p. p. Marooned; p. pr. & vb. n. Marooning.] [See Maroon a fugitive slave.] To put (a person) ashore on a desolate island or coast and leave him to his fate.
Marooning party, a social excursion party that sojourns
several days on the shore or in some retired place; a
prolonged picnic. [Southern U. S.]
--Bartlett.
Wiktionary
marooning party
n. (context US dated English) A social excursion party that sojourns several days on the shore or in some retired place; a prolonged picnic.