is pong an actual term? If so I might've found a CS term better than wyde (2 bytes)
Yes, very much so. A ping is a request, a pong a response.
2 bytes is a short…
2 bytes is a wyde. Because, to quote knuth, "two bytes makes one wyde"
I've heard people use that a lot, but the original metaphor was sonar not table tennis. So it is more appropriately an echo reply (which is what the ICMP return packet is called in the RFC).
I'll give you another one: In Japanese there is the (unserious) term "enbug" which is the opposite of debug.