The perception that potential mates are more sexually attractive than one might think when sober, due to intoxication after consumption of alcohol (not necessarily beer). Cheryl always gets beer goggles when she drinks and then brings home some real losers.
n. imaginary lenses (associated with too much beer) worn by someone for whom all persons of the opposite sex look very attractive. (see also male blindness.) See how Willy is looking at that dog? He’s got his beer goggles on!