With 100% unforgivable they mean that if you die in such state as a non-believer...then you will go to Hell and there will be no hope of getting out of there ever again.
You have the chance to repent and to believe in this world...Allah will forgive almost every sin you have done if you sincerely repent and promise not to do it again...the only sins Allah cannot forgive are the sins and wrongdoings towards another individual...because that would be injustice towards him...This person might request a compensation for your injustice in the-hereafter...so only if this person decides to forgive you for that...Allah will forgive you too...that is the condition for these kind of sins...all other sins can be forgiven when repenting in this world.
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