Re: Giant Oblong Geranium?
1. I have no idea, having never heard this before, but I imagine you've dropped the verb phrase which is most probably "is like" and the object's article "a" -- thus your head "is like" (a) giant oblong geranium = nothing good. It sounds like a funny insult to me. Head likened to a big block head. Head also likened to a dumb plant.
2. What the f*ck. An expletive of surprise and dismay.
3. Woot. I don't know. Possibly you meant to type "Wot" which was used frequently by British humorists, notably P.G. Wodehouse, to mean "what" spoken with upper class diction. It was used not as a real question exactly, but as an amusing ending to a sentence. "I think I may have a nightcap, wot?' Would mean I'm going to have a nightcap (a drink).. what do you think, would you like one as well? what are you going to do about it?"
4. bride-elect. Technically speaking a bride is only a bride on her wedding day, thus... the bride-elect is a woman who has been engaged and is planning a wedding. She has been chosen to become a bride but isn't quite there yet.
One who has a perverse sexual relationship with a prostitute might more easily suffer AIDS than one who insists on proper sexual behaviour may.
The sentence can be improved by changing a few words (might to may -- see note below) (suffer to contact for a clearer meaning of the action) and dropping the final "may."
One who has a perverse sexual relationship with a prostitute may more easily contact AIDS than one who insists on proper sexual behaviour.
For more information on may vs might check here.