Among the currently most popular synonyms for bug are: needle, hump, gremlin, get to, craze, gravel, upset, fixation, irritate, displease, tease, affliction, rage, nettle, pique, wire, error, disturb, passion, bacterium, listening device, tap, irk, infirmity, bacillus, malaise, imperfection, goad, provoke, mania, vex, hobby, mite, peeve, gall, madden, snarl-up, malady, blemish, ailment, complaint, enrage, sickness, germ, exasperate, nark, ride, receiver, badger, rasp, ruffle, glitch, tick off, get someone's goat, wiretap, pest, indisposition, flaw, illness, fault, thing, defect, wind up, infection, antagonize, exacerbate, annoy, anger, disorder, bother, condition, virus, bum out, flea, disease, pastime, enthusiasm, obsession, microorganism, burn up, hassle, midge, pester, infuriate, failing, fad, tee off, breakdown, insect, rile, rankle, get across, microbe, plague, aggravate, get, miff, beastie.