"Roger that" is not an uncommon acknowledgement in U.S. aviation talk. I believe it comes from the military and has crossed over, in small doses, to general U.S. conversational English, typically from former military personnel. It's used to acknowledge (ie WILCO) or as a general agreement(I wish we could get going. "Roger that")
Last edited by misd-agin; 15th Mar 2014 at 19:37.
Reason: added 'typically from former military personnel'