Can you "Impeach" a President who is no longer in office? ?

Trump was impeached a second time while he is STILL in office. The impeachment TRIAL CAN take place while a president is out of office. The question is whether the Senate will convict him or not. NO president who was impeached has EVER been convicted. 

Impeachment was intended to be the legal method of removing an incompetent President from office. so no

The way 80 year old pelosi is using it is as as a simple accusation or indictment accusing someone of making her angry.

Just as with her recent foot stomping hissy fit impeachment of trump . you can accuse anyone of flying to the moon on a broom but proving it in an actual senate trial is just plain not going to happen

Yes, officials have been previously indicted who left office under the same constitutional provision. So, it can be done because it has precedent. Additionally, you cannnot get to disqualification, without first convicting. You can be certain there will be objections, but there is no stopping it now.  

As I keep explaining to people: impeachment is just the bringing of charges. That's already happened.

Yet to come is the Senate trial, and yes, Trump can be tried by the Senate after he leaves office for actions he took as president.

There isn't a lot of point, frankly, but certainly it can be done.  In my view, the Senate shouldn't bother with a trial. It should just vote to bar him from public office, for which it needs only a simple majority rather than the 2/3 majority a conviction in a  trial would require.  Such a vote would be less certain than conviction (which could also bar him from public office), and he might well challenge it in court, but he's facing so MANY legal actions that he also might not bother.

he was in office when he was impeached, so your question is moot 

He already has been impeached, the question is can he be convicted by the Senate when he no longer holds office 

Yes                              

i would hope so but anything is possible