Maybe this example will help, although I thought Byrth's point was really clear:

Let's say you're playing on a PS2. You just finished logging back in after crashing during a cut-scene or an ill-fated attempt to walk through Whitegate.

You receive a /tell from a Japanese guy who mistakenly thinks you are a ten-year old girl. He asks "Are you alone?" and informs you that he is wearing a "Clown's Subligar".

You receive a /tell from another Japanese guy who mistakenly thinks you are a ten-year old girl. He asks "Are you alone?" and informs you that he is wearing "Feral Trousers", and tosses in some more moon runes to convey his feral lust.

You receive a /tell from another Japanese guy who mistakenly thinks you are a ten-year old girl. He asks "Are you alone?" and informs you that he is wearing a "Ucn. Subligar +1", complete with HQ horn.

This process continues until every Japanese person on your server has conveyed to you both his misplaced desire and his specific leg equipment using auto-translate. You've just seen thousands of auto-translated terms on PS2 even though, much like the engine of the Starship Enterprise, it's memory cannot take anymore and is about to blow.

A bunch of new terms added to the PC's Tab-Dictionary would work similarly for PS2 players; they could be seen when used but not easily accessed otherwise.

For PC users this would not be the case; it would be much simpler. They could just access these terms normally from the Tab-Dictionary because the average PC has more memory than a really fancy toaster made in late 2012.