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
, bonds, notes, and mortgages are all types of debt. The term can also be used metaphorically to cover moral obligations and other interactions not based on economic value. For example, in Western cultures, a person who has been helped by a second person is sometimes said to owe a "debt of gratitude" to the second person.
Etymology.
The English term "debt" was first used in the late 13th century. The term "debt" comes from "dette, from Old French dete,
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.