On IRC, the act of using a (in most IRC clients) built-in command to slap another user. Frequently used for comic effect.
<@John> /slap Jim
*John slaps Jim around a bit with a large trout
<+Jim> wtf man why did you trout slap me
by LordKelvin April 26, 2008
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Fucking another mans girl then proceeding to slap him in the face with your unwashed cock.. Therefore, he gets his girls clam juice on his face via your dick.
Dude, mac totally owes me five bucks and just bought a beer without getting me one.. I'm totally trout slapping that queef eater.
by dan192837465 December 12, 2010
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The only time a Singaporean is capable of forming a complete English sentence on IRC
* Singaporean1 slaps Singaporean2 around a bit with a large trout

<Singaporean2> wah liew siao eh trout slap me 4 wad sia
by Partagas February 02, 2010
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The act of tapping or slapping the head of ones penis on the pubic region of a female including but not limited to: the Prepuce, Clitoris, Labia Menora, or Labia Majora. Derived from the sound a struggling trout makes while flopping around on land. One can replicate the sound of a trout slap by taking their index and middle finger and striking them across the palm of the opposite hand repeatedly.
No man, I didn't get it in... I just trout slapped her.
by Rodney123456789 August 09, 2011
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The act of slapping someone - usually across the facial region - with a wet penis or a representation thereof.
Oh dayum, he totally just got trout slapped!!
by Bodacious Wan September 11, 2007
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When one is slapped with a trout(fish).
Oh my Rachel! I just got trout slapped by Amanda down by the river!
by Laurel P. October 16, 2007
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