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1.
A portmanteau of the words infection and affectionate.

A term used to describe when two people (usually a couple) are being affectionate towards each other by means of cuddling, kissing, and everything else couples do to show their love and affection. But, at the same time of affection, one person in the couple is sick, causing the other to get sick not long after.

Kind of annoying, really.
*A couple cuddling*
Girlfriend: Oh, baby, I love you so much!
Boyfriend: I love you too!
Girlfriend: Oh..... I also have a cold, just saying...
Boyfriend: AHH! YOU'RE BEING INFECTIONATE!
by Sho Fo-Sho February 17, 2011
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