I have a wicked prawn allergy; can i kiss my girlfriend after she has eaten said calamitous crustacean?

Maybe: If you try hard, it shouldn't take too long to figure out a few other times when you can kiss your girlfriend. But seriously, a significant reaction is a possibility; if you have ever had a life-threatening reaction to shrimp, you absolutely should not. If you had a relatively mild reaction such as a rash around the mouth or a little stomach upset, you can roll the dice if you feel you need to.

I wouldn't. : Theoretically if she still has minute pieces in her mouth...It could trigger your "wicked" symptoms.