I can't say the exact source you're referring to, but this is a very real maneuver carried out by fighter aircraft in order to reach higher speeds and altitudes. It is a modification of the more typical "zoom climb", and I believe is referred to as such.
A normal zoom climb is nothing special, you simply pull up and let the aircraft slow as it climbs. Normally if you continue this it will reach a speed where it's too slow and begins to stall.
But the way lift is generated at supersonic speeds is fundamentally different than subsonic. It is not uncommon that an aircraft will have two very different places in the performance envelope for the same amount of engine output.
A good example is the EE Lightning, where it was known as an "energy climb". The standard interception profile was to fly normally to a set altitude (25k?), accelerate in a slight dive to go supersonic, then pulling up into a zoom climb. The aircraft would now reach a new altitude (quite high IIRC, they caught U-2s) where it could cruise supersonically. I believe the F-104 was similar.
Shaw talks about it in Fighter Combat, but I can't find a version with snippet view on Google.