What does boosted mean in LoL?

Eloking vs. EloBoost24: Which Elo Booster Reigns Supreme? - Eloking

Elo Boost For Cheapest [ LoL , TFT , Val ] : r/Rankboosting

Informative and insightful video on elo boosting and its inner workings by Dong Huap. : r/leagueoflegends

This post fucking reeks 🤢🤮 : r/ZenyattaMains

League Distribution (NA) 4-19-13 : r/leagueoflegends

Someone can explain me why sometimes I earn a level after a win and sometimes not, I have win a full game 1vs3 and I keep my grade I don't get it

Fairly known streamer is eloboosting on stream? : r/leagueoflegends

Data gathered about Elo boosters after analyzing 841 boosting profiles. : r/summonerschool

How do smurfs/elo boosters carry low elo games when rest of their team is losing the early game? : r/summonerschool

Where does this top laner stereotype came from? : r/LeagueOfMemes