A girl whose head is so large it resembles a large melon. Often accompanied by grotesque facial features such as an oversized and misshapen chin, forehead and nose. To compensate for this serious lack of physical attractiveness, these people will often post unflattering nude pictures of themselves online for attention. Good luck with that.
'Tissue-mellons' is a phenomenon generally recoursed by small breasted girls with insufficient capital to undergo a breast cosmetic surgery. Such girls, striving to boost their self-confidence, wad layers of tissue paper in the bra until a form of cleavage is somewhat contrived. More often than not, this practice ends up exacerbating the whole situation. This is beacuse when the tissue-melloned female proceeds to carnal knowledge, the man's first reactions at the bare pigeon-tits, may have considerable negative effects on the self-esteem of the former - possibly goading the girl to add more tissue-paper the next time she goes out. The 'tissue-mellons' is a vicious cycle.
Example 1
Mary: Hurry up the taxi is here! The party starts in 15 minutes!
Sue: Fuck! Why are we out of toilet paper on a Saturday night?!
Mary: Come on let's go! You can tissue-mellons your boobs later!
Sue: fucking tits!!
Example 2
John: did you bang that chick yesterday?
Peter: yeah dude. I took her to my place and guess what?! She was tissue-melloned! But I fucked her anyways.