Strumming is something you do with guitars, I thought...

I'm guessing he means a roll...?

Yes you are missing rather a lot. Cubase provides midi editors in various flavours: open your part in the drum editor and draw your notes in with the mouse.

Alternatively, if you are using a drum sample library such as BFD there will probably be 'articulation' samples of snare rolls. Triggering one of these will probably sound more realistic than triggering a normal snare sample rapidly.

I racked my brain trying to figure out what it is called. Thanks.

Are there any free VST's that can do this for me?

No. You need to learn how to use your midi editor! You tried reading the manual...?

Pretty tough to do. It's easier to do if you have a controller like the M-Audio Trigger Finger. Otherwise, read up on velocity.

it is very hard to do on a triton because of the weighted keys. huespeh is correct to recommend m-audio but you do not necessarily need a trigger finger or any pad really. you will get very good results with a small midi controller like m-adio oxygen using the keys themselves. they are very light.

to further enhance the realism you should assign 2 adjacent keys, one for the left hand hit and one for the right hand hit to the same drum hit in your sampler ("snare hit" for instance). then change the default velocity of one of the keys to a few ticks lower than the other one. this will replicate the "weaker hand" dynamic of a snare roll.

after recording yourself playing the drum lines it is a good idead to go in and tweak the velocities even further with your midi editor, by random notes here ore there. this takes time and is slightly tedious but it will help you avoid the machine gun sound

Well what is the easiest method of doing drums. Get a pad and a drum kit?

yes but if he had an electric kit he probably wouldn't have asked that question.