How To Add More Data To Existing Cells Without Replacing It

need to add same data to every other existing cell in the column, but not replace the data already in it, but to add to it. I've tried to google the answer and look here, but I probably use bad search terms.

For example, I need to add "QW" after each of these lines:

data1432
data9292
data3933
data3939

so it would look like this:

data1432QW
data9292QW
data3933QW
data3939QW

I have a few thousand rows of data, so wouldn't rather not do it manually cell by cell by typing :-)