How come Snivy is sometimes referred to as "Smugleaf"?

I’ve been hearing this term quite often, and l wanted to know why Snivy is sometimes called “Smugleaf”.

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From bulbapedia

Shortly after its release, much likemany other Generation V Pokémon newlyintroduced, Snivy received thefan-made moniker, “Smugleaf”. Thisname was picked up on and published inan article on video gaming-focusedblog Kotaku and later in an issue ofOfficial Nintendo Magazine Australiaand New Zealand, as well as its UnitedKingdom counterpart.

This is how it became popular. The name likely came from its smug look, and the fact that it is a Grass type.

Smugleaf is the fan made name given to Snivy before its Japanese name was revealed by Kotaku.

“Due to his half-closed eyes and apparent smirk, the green starter is quickly becoming known as “Smugleaf” or “Grinleaf” by English-speaking fans.“Smugleaf is the new trollface!” is a new rallying cry, referencing the face a person might put on while trolling on a forum. And looking at that new Pokémon’s self-contented grin, it isn’t hard to see the appeal.”