So by asking google: how many meters in 100 yards. It comes back quickly with the answer 100 yards = 91.44 meters. A meter stick is just a bit longer than a yard stick, so a good guess is that 100 yards is just a bit fewer than 100 meters. Google's answer is consistent with that expectation.
Trochaic meter is a line of poetry composed of trochees. A trochee is a basic metrical unit called a foot consisting of two syllables. Derived from the Greek trokhaios ('falling, tripping'), this foot's name is representative of its falling rhythm, meaning a stressed syllable is followed by weaker ones.
A fantastic, brilliant time. The craic, pronounced crack, refers to the laughter and banter that goes with having a good night out with friends. If the craic was 90 then it means it was exceptionally good and you were having the time of your life.