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1.
The noise of a stifled snigger made by infantile males when confronted with a tenuous "double entendre".
Q: "Would you like breast or leg?"
A: "fnar"
von zeno 25. März 2005
 
2.
1) Fnar, abbreviation for "For No Apparent Reason"

2) A character in the comic "Jack" (by David Hopkins) at www.pholph.com
1) Then he dropped over dead fnar.

2) Fnar is innocent and unaffected by Hell.
von Horza 13. Juli 2005
 
3.
Acronym: For No Apparent Reason
....fnar
von Ender 4. November 2003
 
4.
An exclamation of annoyance and frustration. Normally used when changes of circumstances and factors beyond your control have disrupted plans. Sometimes used in sympathy for someone in the above situation.

Similar usage (but inverse meaning) to w00t! The tone of voice is more important than the word.
"Fnar!"
"What's up?"
"I've just found out I've go to work overtime and can't go clubbing tonight"
"That sucks!"

"... but now it looks like I can't go - I'd even got a pith helment specially for the occasion."
"Fnar"
von SPAN-R 8. Mai 2009
 
5.
Acronym meaning "For No Apparent Reason".
Guy 1: *slaps closest person*
Guy 2: "hey! why did you do that!?!"
Guy 1: "fnar"
von TWZ 2. August 2005
 
6.
The sound made during particularly enthusiastic cunnilingnus.
"fnar fnar fnar"

*woman orgasms*
von Shadow_Wolf 22. Dezember 2004