i am indebted to my bank ,what does that mean?
It means you owe the bank money.  The bank is the lender or creditor
so do i have an obligation to repay,since im not fully aware of my debt portfolio
Yes, if you owe the bank money, you need to pay them back.  It's a moral obligation.
well,there was no collateral demanded,it was given based on personal grounds you know
What kind of debt is it?  There are several kinds, such as mortgages, notes, bonds and loans.
simply a loan portfolio so says the bank manager even though i dont understand that jargons
Debt
Debt is when something, usually money, is owed by one party, the borrower or debtor, to a second party, the lender or creditor. Debt is a deferred payment, or series of payments, that is owed in the future, which is what differentiates it from an immediate purchase. The debt may be owed by sovereign state or country, local government, company, or an individual. Commercial debt is generally subject to contractual terms regarding the amount and timing of repayments of principal and interest. Loans
de Melo Coutinho, the hero of the “Battle by the Lake”. So intending for a peaceful solution He encountered Diogo de Melo publicly and questioned him “Diogo de Melo what do you mean? I own I owe you my life, and since you have given it to me and saved me from so many enemies, don’t be the occasion of my looing it.” These words released the tension between them and the demonstrations ended with Diogo de Melo publicly accepting and praising the leadership of Afonso Pereira.