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Japanese flag 

What you call your sheets after you rail a girl so hard she bleeds all over them.
I made that girl buy me new sheets after she turned mine into Japanese flags.
Japanese flag by Lil' Bandit January 16, 2008

japanese flag 

1. when a female has her period on your white sheets

2. when you fuck a virgin and she bleeds on your sheets
that bitch bled on my sheets so i hung it out the window
japanese flag by R()$$ December 26, 2004

japanese flag 

Last nights vindaloo left me with an arse like a Japanese flag!!!
japanese flag by Chimp Boy July 29, 2003

Japanese Flag 

The lower digestive tract phenomenon resulting from the previous night's consumption of ultra-spicy food, usually curry or extra-hot Mexican burritos.
Did you have the korma last night, mate? I shouldn't have had the vindaloo; it gave a me the proper Japanese Flag.
Japanese Flag by Azenath69 September 6, 2022

Japanese Flag Syndrome 

The sickness where you spend most of your time sitting on the toilet, usually the day after eating spicy fast foods.
Joe called in sick to work, said he had an extra spicy indian last night and his ass now looks like the Japanese flag.

Ah the old Japanese Flag Syndrome then? Rough day ahead for Joe!
Japanese Flag Syndrome by defunkt October 1, 2011

japanese flag week 

N., referring to that delightful week most women expel from their uteruses a lining consisting of blood
Yeah, she's being pretty assie she must be celebrating Japanese flag week.
japanese flag week by Stew Pedasso October 31, 2003