Green’s Dictionary of Slang

(gay) walking.

1972		(ref. to late 1960s) B. Rodgers Queens’ Vernacular 212: When walking, a gay takes the Jewish [Italian, Polish, etc depending on personal bias] airlines (kwn SF, late ’60s).
1986–7		Maledicta IX 59: Polish airlines n [R] Walking; homosexual slang.

(gay) dried nasal mucus.

1972		B. Rodgers Queens’ Vernacular.
1986–7		Maledicta IX 59: Polish handball n [R] Dried nasal mucus; homosexual slang.

see pop n.¹

a cursory wash or the application of deodorant to unwashed armpits.

1997		M. Stone Long Reach 104: He l[...] didn’t have time to clean up again. Instead, he opted for what he referred to as a Polish shower: warm water on the face and a couple blasts under each arm with Right Guard.
2002		gmc.tzo.net 🌐 Those of you in fraternities know what a Polish Shower is. When you wake up for a 10:00 class at 9:55, you wet your hands and run them through your hair, put on a hat, spray some cologne, and dash out the door.
2002		www.hatsofftolarry.com 🌐 I’ve noticed that budget travelers love to put on deodorant without taking a shower. This is sometimes referred to as an ‘English shower’ or a ‘Polish shower.’ Personally, I do not condone this practice. I would rather smell like the ass of a yak then put deodorant on a greasy, sweaty armpit.
2011		A. Vera Find It [ebook] Did he take a polish shower with body-spray because he thought it would diffuse throughout the earth’s atmosphere.