A foul language term in Cantonese , mainly used in Hong Kong.

When someone did something stupid or doing something silly. We will usually call them " on 9 " - Which means " stupid penis " in english.

the number " 9 " is from the pronouciation of " penis " in Cantonese.

An excellent word for saying this to people in Hong Kong.
Mr.Tung is an on 9. ( Mr.Tung is a stupid penis )
Don't be on 9 la. ( Don't be stupid )
by Scottie August 25, 2004
Get the on 9 mug.
In front of a certain or said individual.
He cheated on her 9/9
by Roriro July 11, 2021
Get the 9/9 mug.
Something you type accidentally when you mean to type :( but don't hit the shift key.
Person 1: my grandpa just died.
Person 2: :9
Person 1: wtf is wrong with you?!?1
by DylanPaterson December 26, 2019
Get the :9 mug.
A "smiley" similar to :P, but meant to indicate something appetizing or drool-inducing. The 9 forms both the smile and the tongue of the face. Often used in chatrooms.
<Village Idiot 472> you're a cock-sucker!
<MEsoHOORNY> :9
by pwrnapper March 16, 2009
Get the :9 mug.
A number equal to 1 to anyone who understands math.

Topic should not even be a debate, however, it is understandibly quite hard to accept by some.
1.) All sequential repeating decimals can be expressed as the repeating series divided by a 9 per each digit.

For example, 3/7 = .428571~
Thus, 428571/999999 = .428571~
Therefore, 428571/999999 = 3/7

When we apply this rule to .9~:

9 is the repeating sequence. We put it over an identical number of 9's, which is one 9, thus giving us 9/9, which is 1.

2.) All rational numbers can be expressed as a/b with a and b as integers. .9~ is a rational number. Thusly, it can be expressed as a/b. 9.~'s a/b expression is 1/1. To all those who disagree, I challenge you to find another possible way that .9~ can be expressed as a/b.

3.) For any two numbers, there is an infinite number of other numbers that fit between them.

Example:
1.08, and 1.09.

1.081, 1.0801, 1.08001...

There are no numbers that can fit between .9~ and 1. thus, they must be equal.

Demonstrations:

1.)

Define x as .9~
x = .9~
10x = 9.9~
10x - x = 9
9x = 9
x = 1

Thus, .9~ = x = 1

2.)
1/3 = .3~
1/3 X 3 = 1
.3~ X 3 = .9~

If .3~ and 1/3 are equal, identical operations on them result in an equal product. Thus, .9~ = 1.

ARGUMENTS:

".9~ is not equal to 1, it gets closer to 1 with each 9 added but never reaches it"

Reply: .9~ is a number. This means it has value. The value of .9~ doesn't "get closer" to anything. It is a number, and has value.

"If .9~ equals 1, then doesn't 1.9~ equal 2, 2.9~ equal 3, 3.9~ = 4, and so forth?"

Reply: Yes.

"There is no point at which as certain number of 9's makes .9~ equal 1."

Reply:

Of course there isn't. If there were a point at which a certain number of nines "made" .9~ equal 1, then it would not be .9~ that equaled 1, just the decimal with enough nines to reach that point.

A "certain number of nines" directly contradicts the concept of an infinite string of nines. Approaching the question from this angle is entirely illogical.
by YHHAWNFTPSHI May 4, 2009
Get the .9~ mug.
Way to say you hustle. Most people work 9 to 5, but you put in more. You have the 9 to 9 hustle.
I hustle. Big work posted everywhere with the 9 to 9.
by mackrock17 April 19, 2007
Get the 9 to 9 mug.
<%Snake^_^> dude iama get botox on my ballz like dave chappelle
<%Kylelotus> :9
by Snake^_^ February 4, 2005
Get the :9 mug.