"Jon Lee" can be used as a noun, verb, adjective, adverb, pronoun, or interjection and can logically be used as virtually any word in a sentence ("jon lee the joning leejons."). Moreover, it is one of the only words in the English language which could be applied in the middle of a word (e.g. "Am I sexy? Absojonlee!") It hence has unlimited metaphorical meanings. The verb "to be jon lee'd" can mean "to be cheated" (e.g. "I got jonlee'd by a scam artist"), or conversely, to be sexually penetrated. As a noun "a jonlee" or "a leejon" may describe a contemptible person. The word can be used as an interjection, and its participle is sometimes used as a strong emphatic. The verb to leejon may be used transitively or intransitively, and it appears in compounds, including jon my lee, jon it up, and leejon with. In less explicit usages, jonlee or leejon with can mean to mess around, or to deal with unfairly or harshly. In a phrase such as "don't give a jonternougat", the word is the equivalent of "damn", in the sense of something having little value. In "what the leejons", it serves merely as an intensive. If something is very abnormal or annoying "this is jon'd in the lee" may be said.
All credit goes to (natejont) for the creation of this word.
This and the definition above by mhuang2286 are both correct.
Remember, jon lee is always changing and evolving. Tomorrow, it may be something different, but it's roots are still in jon lee. Here, many examples are used to convey some meaning to this leejon. However, the most important rule of use of the jon lee in everyday life is that jon lee and all it's variations can mean anything. Don't assume that it means something negative or derogatory, it could be anything.
(noun). Look at that jon lee overthere man!
(verb). I'm going to jon lee you up the butt.
(adj.). That cookie is so jon lee'd man.
(all). I'm gonna use my jon lee to jon lee you up the butt in a jon lee fashion.
(casual). Jon lee man!! Jon lee!