The rush one gets when he or she is promoted to a very high and authoritative position in a company's corporate hierarchy and eventually becomes an asshole.
"Watchout for the powertrip. Jack just got promoted as a corporatedirector for our firm"
lots of people once thaught that typewriter was the longest but powertripper beats it by 2 letters, but if you allow -'ings then TEETER-TOTTERER is longer by another 2 letters.