ABI = abiturientti (Finnish) A person studying for the last year in the Finnish equivalent to high school. The last year in high school is actually very fun in Finland, the ABIs get to party a lot.

To the other, younger, students it also seems the ABIs never actually do any studying, since they do most of their studying at home preparing for the final exams and only come to school to do various other things. This is escpecally true in the second half of the school-year.

At least to me this was the best time ive ever had in school, not counting college/university parties of course ;)