/usr/bin/wget

I am also totally lost... What is "leet"?

Leet (or "1337"), also known as eleet or leetspeak, is a system of modified spellings and verbiage used primarily on the Internet for many[citation needed] phonetic languages. It uses some ASCII characters to replace Latinate characters in ways that play on the similarity of their glyphs via reflection or other resemblance. Additionally, it modifies certain words based on a system of suffixes and alternate meanings.

The term "leet" is derived from the word elite. The leet lexicon involves a specialized form of symbolic writing. For example, leet spellings of the word leet include 1337 and l33t; eleet may be spelled 31337 or 3l33t. Leet may also be considered a substitution cipher, although many dialects or linguistic varieties exist in different online communities.

The word "leet" is also simply used as an adjective to describe formidable prowess or accomplishment, especially in the fields of online gaming and in its original usage for computer hacking.

I think leet speak is regarded as a joke by almost everyone, nerds included.

You're right, seems like a pretty obvious feature to include in a browser, had never considered that before. There's probably a chrome or Firefox extension that will do it.