Please, What Does It Always Mean, This… This “Junior”?

If you’re a Child of the 80’s and/or an appreciator of the finer things in action/adventure cinema, I do not think you can view this on-set shot of the world’s most [in]famous movie archaeologist and not get a slight thrill of anticipation.
Also, you’ll be humming “Bum ba dum bum, bum ba daaaaa!” for the rest of the day. Guaranteed.