Is it ok for guys to get their armpit hair lasered off or is that too girly?

It's perfectly fine, it's body hair, I say do it!

The ancient Egyptians certainly didn't think so. Both men and women removed their body hair because they considered it unsanitary and dirty.

You're not wise if you don't know what a hair trimmer is. I bought a Wahl homecut combo and clipper oil on Amazon for like 25 bucks. It literally takes me 30 seconds to trim my armpit hair off down to stubble and I do that every month or two.

It's perfectly OK.  That's a matter of free personal choice about one's own grooming preferences.  However, he might find it uncomfortable since the hair serves as a sort of roller bearing as the arm skin slides over the body skin.  He may not like how the bare skin grips itself and may have to apply talcum powder or something.

So, who's going to know how you removed your armpit hair?  It sounds like a good idea to me.