Having or containing a 3XL-4XL thong that is tight around your croch or head. Soon to be a famous brand.
Dude, you have a jonathong on your head!!
The act of licking one's thong and tickling the ass cheeks until one laughs. When they laugh its a Jonathong.
Bobalinda: 'haha stop you "Jonathon" it tickles too much!'
Jonathon: 'They dont call it the "Jonathong" for nothing'