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1.
The act of giggling and snickering simultaneously.
The girls were sniggling as the gangling pimple faced teenage boy passed by.
by Kelli Lea September 10, 2008
 
2.
When a bearded man performs cunnilingus on a woman
Woman: "Sniggling with him tickles."
by Chrelg February 12, 2009
 
3.
When people are laughing ridiculously without any type of bodily control and freaks out people, preferably Mexicans.
*Guys playing Halo and a person gets blown up by tank*

Man1: "HAAAHAHAHAHAHAHAAAAA!!!"

Man2: "STOP ALL DAT SNIGGLING!!!"
by Kane Chitty March 07, 2014
 
4.
(Verb.) To fish for eel with a baited Hook.
Go away, I am sniggling.
by The Big Bad Jew October 19, 2004
 
5.
when you cuddle with a random chick, stick your finger in her ass, and then run away giggling.
Justin was sniggling with Jackie and tripped on Yan's cock when he was running.
by Gizzene December 15, 2006