F. Williams Hop-Heads 21: ‘May’ll be having bugs in a few minutes.’ [...] ‘Bugs?’ I queried at the risk of showing gross ignorance. ‘Coke bugs!’ she exclaimed in surprise. ‘You’ve seen “fiends” have them, of course. Imagine bugs are under the skin. Comes from seeing the shadow of the needle on your arm when you’re taking a “shot”.’.at have bugs (in the head) (v.) under bug, n.4