I started out using it as a currency when the price went above $500 and then it went down to $300 and I started to hodl. I tend to stop using it as a currency, when the price drop below the average level at what I bought it for.
In every sense of the word, I only use the profits between the buying and selling price, and never use more than the amount I put down to buy it. < Example – Buy $5000 worth price increase and the profit is $500 Spend the $500 worth, but keep the reserved amount of coins >
 
Do not spend any, when the selling price goes below the buying price.

bitcoin is a currency in the short term, but people hold it for many years and see it as an investment.
imo its both

No reason it can't be both. Most currencies typically are both held and traded.

I think for most it's like an investment for now and the simple logic behind it is there aren't many places you can spend it and if you spend it the process of buying for some is a little difficult, so they buy it and hodl it hoping they can sell it when the price is up, like the early adopters did. We need more businesses, at-least online ones at first to start accepting Bitcoin so that more people use it to buy stuff and don't just hodl it for future.

The buying/selling process needs to be simplified but it's difficult since most of the exchanges are demanding KYC forms to be submitted now and people tend to avoid giving personal information to unknown websites.

The safe and also correct answer is to say bitcoin is changing constantly its properties. For now it is mainly used as investment method because there is still promise of price increase and some even believe that price will reach 'the moon'. But when bitcoin will be mass adopted then 'investment' part of it will be lost.

I'd say that it doesn't fit neither of the definitions 100%. But then again, it's perfectly flexible use applications make it whatever you want it to be.

Yeah, it is a currency in short term and investment in a long run, as we are using it as a currency to buy products online or transfer funds online but it would be great to hold bitcoins for future as it can be proved to be an best investment product, but again the adoption level would play an important role in future success of bitcoins.

Currently, Bitcoin is already both.
It is already used for some years as a currency and every day more and more people and businesses are using it. And now that the Federal Trade Comission considers bitcoin as a commodity it ca also be considered as an investment.

Im just start to learn any investment method fot real money, because of that i will not took bitcoin as an investment, its totally just digital currency

first i think it is a currency ,therefore it is an investment too.dollar is a currency but it is also an investment for the rest of the world.