Three letter word-Lag.
If you lag, this means the packets sent are being slow-
Ex. One
You====Packets=======>Server
Imagine the "=" as time in seconds.
Now, if there is less lag, then-
Ex. Two
You==Packets==>Server
Server gets the packets that were lagging.
Now, the server must relay all the packets to the other connections, or other clients (People playing the game).
Ex.Three....................................====== >Client
You====Packets====>Server======>Client
.................................................= =====>Client
So, other people cannot even know that you have moved until the server recognizes it and then sends those packets to them.
So, to "tele", you can Lag, do your jumping, and by the time the packets (Overflow) and reach the server, and send to the clients, you will seem to have teled.
There is a similar theory with time travel. If you imagine "freezing time", only you will realize that it is frozen, thus, in a way, there is still the same amount of time as if you did not freeze time. For example, if you froze time, then 5 years later un-froze time, 5 years still passed for you. Only to everyone else did no time pass at all. With that said, it also applies to this tele trick. Although to everyone else you magically appeared at the location, you still had to jump all the way over there.
Sorry for an un-clear explanation on my method of tele, hope it made some sense or at least enough to allow you to understand where i was coming from.
-Katsu