One trem that I also see getting overused is "shotgunning"
This started with the AR crowd when referring to tippping the upper reciever up to remove the bolt. In this context it is appropriate becuse the motion is much like opening the action on a break action shotgun.
But, I've also heard people talk of "shotgunning" an AK
As for tactical,
I think "tactical" got it's start from those not wanting to say "assault rifle" when referring to military-style semi-auto rifles. I call my DR200 a tactical rifle. Not a 100% perfect correct denotation, but t's a consise term and easily understood. But, yes "tactical" can get out of hand also.