A colloquial expression used to emphasize that something is extremely or exceptionally so (often used as '超がつくほど...').
彼は超がつくほど几帳面で、予定表がなければ落ち着かない。
He is extremely meticulous — he can't feel comfortable without a schedule.
このケーキは超がつくほど甘いから、一切れで十分だ。
This cake is extraordinarily sweet, so one slice is enough.
超がつくほど忙しくて、数日間寝坊する暇もなかった。
I was so insanely busy I didn't even have time to oversleep for several days.