BBCode on 4chan (also ref. TGML (a.k.a. S3KR1T K0DZ)):
[b] bold: bold
[i] italic: italic
[m] courier: courier font (also useful for FIXED-WIDTH font ASCII art)
[o] overline: overline
[s] strikeout: strikeout
[u] underline: underline
[sup] superscript: superscript
[sub] subscript: subscript
[code] for commenting code (as [m] except colorized): raise DuhError('log exploded') # shitty back-end
[aa] ASCII art: preserves spaces and uses PROPORTIONAL-WIDTH font for ASCII art
[br] line break:
[spoiler] hides text unless mouseover: spoiler
[#] : literalizes all BBCode tags (a backslash just before a tag does the same thing)
[rem] hides all text inside it
For color GREEN, use quotes in [code] tags:
[code]"This is green text."[/code] becomes "This is green text."
For color RED, use beginning # in [code] tags:
[code]# This is red text.[/code] becomes # This is red text.
Colors PURPLE and BLUE are for code keywords and function names. You can't make lines of text from those colors.
Quote codes:
> This is the quoted material.
... looks like this:
This is the quoted material.
The ">" quote code is only used at the beginning of a line, and also stacks up to 3 deep with spaces between them (without the use of the [o] tag):
> > > Lick my balls. > > NO U! > The both of you can STFU!
... looks like this:
Lick my balls. NO U! The both of you can STFU!
Allegedly, to multiquote more, put "> " before the first line end the line with [o] then put "> > "before the next line of text, again ending with [o] third line: "> > > " then end with [o] then on another new line close the three [o] tags.
...
For characters, use Lucida Console font.
There are special tripcodes and names (like "sage") that produce different effects.
ON THE IMAGEBOARDS:
To triforce: [alt-255] [alt-255] [alt-30] [enter] [alt-30] [alt-255] [alt-30]
To greentext: Enter a ">" before the text, this only works if you have no text on the line before ">"
To quote: Click on someones post number
To sage: Type "sage" in the email field -- this allows you to post without bumping a thread
To noko: Type "noko" in the email field to auto return to the thread you posted in
To blankpost #1: Hit enter a couple of times in the reply box
To blankpost #2: Hold alt and type 0173 (Microsoft Windows only); this creates a textless character that will leave you nameless if typed in the "name" field (no "Anonymous") or can be used to bypass wordfilter as well
To PENIS: Type "PENIS" five or more times; it will filter your entire post to the word "PENIS" once and unfiltered. This also works for "VAGINA" and "BUTTSEX".
To type PENIS into a post without it being highlighted and without filtering the whole post to 1 word, type pe:getprophet:nis ... put :getprophet: in the middle of any filtered word.
To "red name": Use a textless character (see alt+0173) in the name field and then type the desired name in the subject field. Subjects are ALWAYS red.
You can impersonate moot by using moot#faggot in the namefield and ##Admin in the subject.