Er, sorry. Bit of forces speak! Means genuine, as in 'the information is genuine'.
"So the gen is we're tits up on sticks in the shed?"
Means the aircraft is broken, and has been put in the hanger on jacks...
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball