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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.
автор: Kelli Lea 10 сентября 2008
 
2.
When a bearded man performs cunnilingus on a woman
Woman: "Sniggling with him tickles."
автор: Chrelg 12 февраля 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!!!"
автор: Kane Chitty 7 марта 2014
 
4.
(Verb.) To fish for eel with a baited Hook.
Go away, I am sniggling.
автор: The Big Bad Jew 19 октября 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.
автор: Gizzene 15 декабря 2006