The word means cunt or pussy in Croatian, Bosnian, Serbian. Often good girl friends call each other picka as a term of endearment. Yes, you read that right, as a term of endearment. Approximate pronunciation would be /pee-chka/.
a gay fat teacher who cannot teach at all or do anything right except nip out and make all of your hopes and dreams come crashing to the earth in a spiraling hell-fire and make you want to comit suicide by looking at his gay comb-over and his huge nipples