Lyric discussion by EmmaExecute 

Cover art for Poison Ivy lyrics by Jonas Brothers

I think its because Taylor Swift had chlamydia and she spread it to Joe, its so obvious:

I just got back from the doctor He told me that I had a problem

I tried to scratch away the issue All I ever get is tissues

And now I found out you were lying When you told me you were trying Just to medicate your rash

thats why Joe hates Taylor, because he got the chlamydia Everybody gets the itch Everybody hates that -----

All that 27 second phone call Joe made to Taylor when they were breaking up was the first two lines...

LMFAOLMFAOLMFAO ILYYYYYYY

That's BOLLOCKS! You can't get allergic to Chlamydia and even if you could, that's not the case! Stupid rumors that makes no sense...