Berwick-upon-Tweed

(typography, especially in typeface names) Initialism of プロポーショナル (puropōshonaru, “proportional”).

(chiefly in popular music) wow; whoa

(entertainment, music) Initialism of プロデューサー (purodyūsā, “producer”). / (more specifically) Used in the names of musicians who produce music featuring VOCALOID or adjacent software.

(Internet slang, often repeated) LOL; an expression of amusement or laughter.