Used in 2 prominent ways:

1. Used as japanese slang for "Thank you," as 3 and 9 are "san" and "kyu" respectively.

2. Used to reference Hatsune Miku, as the alternate way of saying 3 and 9 are "mi" and "ku" and thus can be used to reference her.
"3939."
by Hardstuck Internet August 3, 2019
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Japanese style of "Thank You"
3 = San (spelling "sun")
9 = Kyu
39 = SanKyu = Thank You
A = Hey, this for you
B = 39 ( San Kyuu )
A = Iie douitashimashite ( or " you are welcome")
by cholincool July 14, 2008
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In Japanese, 3 is "san" and 9 is "kyuu".
In a Japanese accent, "Thank you" sounds like "Sankyuu", people will often use "39" as a way of saying thanks.
A: Here's that CD you wanted to borrow.
B: 39
by ihaveapseudonym June 4, 2010
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Screw 69, have you heard of 39? This number resembles anal sex.
You know how I lost my virginity last night? I did 39 with my girlfriend, and now she’s my wife!
by Not a legend 27 November 14, 2019
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Emoticon that denotes anilingus. Turned on its side, the 3 becomes butt-cheeks, the 9 becomes a smiling mouth with tongue.
Hey, baby, I'd really like to 39 ;-).
by starved in ph August 6, 2006
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the age before 40 and the beginning of the end. It's all down hill from here, girlfriend! Time to put it in reverse and back that ass up!!
She's 39.. it's almost over for her. "tick, tick tick".
by coming up roses August 22, 2009
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