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1.
Something that is so ridiculously bullshit that the word bullshit does not suffice.

Used to define something that is so ridiculous that it is either humorous or does not make any sense.
That speech by Andrew last night was such a bunch of jargin that Marc started getting real fucking pissed.
by Nebyula1 May 11, 2011
 
2.
the penis cock dick penis
Ouch! My jargin

Did she touch your jargin?
by jordan macneil January 02, 2004