Trigonometry is referring to the last time he was in the Mountie's Hall.

That happened in the final trailer for Trigonometry Jones and the Lost Compass.

For anyone who joined in the past five years and missed out, or are wondering about "Part 144/89", check out the following:

For a quick read, check out the Comics-Only site, starting here, and then continuing here.

Or if you might want to comment, check out these blog entries: 1/1, 2/1, 3/2, 5/3, 8/5, 13/8, 21/13, 34/21, 55/34, 89/55, 144/89, 233/144.