yeeshkul is an unknown term that the bootlegger yells during the famous 1973 pink floyd concert at maple leaf gardens. No one really knows what this refers to
Ard fucking yeesh is a substitute for "hell yeah." The phrase "hell yeah" has become stale among America's youth as there needs to be a new phrase to add excitement to a fun night hanging out with one's pals. "Ard fucking yeesh" technically translates to "alright fucking yes," but it can be used in a variety of ways such as "yes," "fuck yeah," and "hell fucking yeah."