1. Slang term often used to replace "shit." Derived from the process of editing the vocals of rap-songs by revershing the curse words so said song could be played on radio or television.
1. That's what I meant to say... ish.
2a. Come over at 12-ish. (give or take an hour)
2b. Come over at 12:30-ish (give or take half hour)
2c. Come over at 11:10-ish (your choice; five minutes or ten)