I talked last time about the Japanese penchant for abbreviating Japanese or kana-based English words, either to make unwieldy phrases easier to use or to show affection for their favorite drama, anime or tarento (TV talent). It's also quite common for Japanese to create English-based abbreviations for everyday words, which they invariably expect native English speakers to somehow magically understand just because they're written using the Roman alphabet. During GW (Golden Week) we might want to drive up to the mountains, so we'd get on the IC (interchange, or freeway on-ramp) then stop at a PA (parking area, or freeway rest stop) along the way to eat. While filming a CM (TV commercial), an actor made an NG ("no good," meaning an on-camera blooper), then forgot his TPO ("time, place, objective," i.e. his overall social situation) and cursed loudly. In some cases these abbreviated English words seem strange to Americans, but it turns out they've been imported from Britain, as with WC, meaning Water Closet (no, not that one). Anime fans tend to learn a lot of these specialized abbreviations, such as OP and ED (the opening and closing theme songs in an anime), or OST and BGM (original soundtrack and background music), which can lead to confusion when talking with non-fans who don't know what the heck you're talking about. Some of the "English" abbreviations that become popular in Japan are actually based on Japanese words, such as the slang KY, short for kuki yomenai or "can't read the air," referring to a person who isn't good at picking up on the feelings of those around him. Another slang word is TPI, supposedly used by high school girls to describe unfashionable males -- it stands for t-shatsu pantsu ire or a man who has tucked his T-shirt into his underwear.
A P.A. is a Parking Area, where you can buy food, gas etc. within the closed freeway system.
