Is someone who has one (or more) Allergy/ies and is always bitching about it, so that they, and the people around them, can't enjoy their time at all.

It's a subdivision of attention whores.

"Oh I can't hug any of you because you all ate from that Nutcake and I'm allergic to nuts"

It's the sweat that accumilates under big boobs

In the whump fetish and sneezing fetish communities, an "allergy whore" is anyone who has a sexual penchant with allergies, particularly nasal allergies/rhinitis and their symptoms. Allergy whores may like visual, auditory, or literary media where allergies are described or emphasised.