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6.
A ‘roidhead who is stupid enough to think he needs fake muscles to be good at sports.
That kid was such an asterisk I don’t even think he knew what he was doing to himself.
by allstarQB September 05, 2008
 
1.
A symbol used almost only for replacing the vowels in a curse word by those who are too scared to type the real word.
use of the asterisk:
b*tch, f*ck, f*g, sh*t, *ssh*le, qu**r, wh*re
by Your seudonym November 10, 2009
 
2.
Not just a symbol(*). But a reference to one's sphincter, specifically the anus.

Notably used by Kurt Vonnegut in his novel Breakfast of Champions. Also appears in the Dresden Dolls song, The Kill.
The infamous Asterisk:

http://www.vonnegut.com/images/art/aug06/01backdoor.jpg
by Lame. January 07, 2009
 
3.
(verb) 1. to use one or more asterisks to cover up a suggestive word. You can asterisk the word 'fuck' as f***.
2. to make or cause to seem (a word) suggestive.
1. Your write-up is full of asterisked words.
2. Do not asterisk words haphazardly. There is no need for asterisking the words 'promiscuous' and 'sexuality'.
by uttam maharjan December 31, 2011
 
4.
Symbol used online for 3 things usually.

1. Bolding or emphasizing a word where font types are unavailable.
2. A way of setting off a word that gives what you're writing a "tone" without actually leading the reader to believe that you're saying the word.
3. Making a correction to a previous mistake.
In order of the definitions of asterisk:

1. I *really* want to come over and rotate your tires.
2. *grin* If you gt what I mean.
3. *get (or get*)
by XadaTen December 28, 2013
 
5.
A star shaped symbol (*) used to correct or clarify a spelling mistake when said mistake cannot be edited. Typically you'll see these types of corrections in chat rooms, text messages, or fast comment chains. These corrections can be applied by the original commenter or by another person.
(Asterisks when commenting on a cat picture on Facebook)

Jess L.: If you kep putting that cat in sweaters, your going to get mauled.

Jess L.: keep*, you're*
by Emobluejay January 05, 2014
 
7.
A symbol used to signify action when talking on IMs.
The asterisk is the * symbol.

Guy one: *cough* loser. What were you thinking? *bitch slaps*

Guy two: I don't know. Anyone could have made that mistake.
by Gibberling February 15, 2006