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1.
From the Harry Potter series written by J.K. Rowling. Parseltongue is the language of Snakes.
"Harry we heard you speaking Parseltongue!"
by Dumbledore July 26, 2004
 
2.
The act of cunnilingus
Mate did you go down on her?

Yeah, love a bit of parseltongue
by LordWillberforce August 12, 2011
 
3.
Backwater slang for programming in python.
I'm gonna go speak in parseltongue to finish up my interactive text version of Monty Python and the Holy Grail.
by b5200 March 16, 2009
 
4.
the language of asians
"Yo, how annoying are those asians speaking parseltongue in the computer lab?"
by smeg my leg February 09, 2009