Here‘s a few I‘ve heard all summer:
UFI = Useless F‘ing Information
Dirty Billy = A soldier who can‘t be bothered to use good hygeine
Shack hack = Coughing you get from spending too much time around Dirty Billies in the barracks
Wierdo = Anything not recognized, such as a strange bug seen in your mod tent ("Look at this wierdo bug thing")
Bumblast = To wander aimlessly around the field/range/training area
Bumblaster = Someone who wanders aimlessly (see above)
MIR Brigade = Those soldiers who are unfortunate enough to be injured and have to form up in the gimp rank behind the rest of the platoon
Kit Bag Drag = What happens when you get kicked off course
Muckle on (to) = To attach yourself to or go with a person/thing/vehicle ("Go muckle on to Sgt Bloggins...")
Beetle = To scurry or move quickly
RHFC = Royal Horse F‘ers of Canada (apologies to the Highland Fusiliers, I actually all the ones I‘ve met so far)
GGFG = Gustav Gone For Good (apparently they lost a Carl G or two)
G ‘N‘ SF = Ground Nuclear Special Forces. Doesn‘t really work though, because their abbreviation is "G _AND_ S F", so I‘ve also heard "Gay and Silly F‘ers". I wouldn‘t dare tell them that, though, most of their NCO‘s are hard as ‘poop‘.
Ankle Buster = Tank ruts at Meaford (or any other base, I guess)
That‘s all I can think of from this summer.
[moderator note: veiled profanity edited out. Please keep your language civil, especially for young and impressionable readers]