Wiktionary
phr. (context idiomatic informal sometimes humorous English) (non-gloss definition: Used to instruct a couple to stop displaying physical affection in public.)
Usage examples of "get a room".
She'd get a room, take a quick shower to sluice off the grime of travel and wake herself up, then call in to HQ.
You didn't have to show a financial statement or a marriage certificate to get a room.
We would hike eight miles, get a room, have a shower, phone home, do laundry, eat dinner, buy groceries, watch TV, sleep in a bed, eat breakfast, return to the trail.
She knew she should get a room somewhere, and she should eat something, but it didn't seem to matter.
She knew she should get a room somewhere, and she should eat something, but it didn’.
She was lucky in that overcrowded place to get a room to herself, a room with a balcony overlooking the harbour.
He would go to the inn and get a room, but would remain in Carradoon only until he had studied the spells that would allow him to leave quickly and without the possibility of being stopped.