Generally used in IT. Whereas a caller comes on the phone saying they've already done the thing that the engineer is most likely to ask first. The engineer will ask the user to do it while on the phone and then it suddenly works.
In other words, the user has just lied their bollocks off.
Caller: Hi, i've already rebooted my pc like 3 times and my program doesn't work
Engineer: Can you reboot your pc while on the phone to me right now?
Caller: Ok *wait for a minute or two
Caller: Oh! It's working now.
Engineer: Of course it is, that's Engineers Luck. Bye now.
by Ld Havoc January 23, 2007
Get the Engineers Luck mug.