бустит? What does these mean?
I have no idea. Is the person who said this.

I don't know. I'm not an expert.

Are you that very man who...?

Sorry. I meant
ASK the person who said this.

Alright, it's some random user on telegram who messaged my friend and said those words, that's all I know so far.

do you both play on computer games? You can found more in that field

Well, in this case the context would be helpful.
There is no word бустит in Russian and, naturally, English 'boost' is what springs to mind - "Are you the one/person that/who boosts?". However, out of context this makes little sense to me.

Me and my friend do play games, but the person who talked with my friend is a stranger.... like my friend doesn't know who this person is, and keeps on getting messages from those people.

thanks for the explanation grumbler

by the way the person recently asked my friend in English, "Aren't you the person who pushes the ranks?". I guess that's the meaning of what the person said in russian...

but thanks for the contribution anyway...

Give him an advice to take up English thoroughly. :)

What does rank push mean?
More simply, the game mode where players get points when they win and subtract points when they lose. Push ranking. Press = press. Rank = rank. Push rankings can therefore be interpreted as Boost rank.

There is no word бустит in Russian

https://ru.wiktionary.org/wiki/бустинг

спец. в онлайн-играх — повышение уровня чужого аккаунта за деньги

oh thanks for the info, Валерий Данилин. i thought that word isn't there.