To rush B is to rush towards a site or place as fast as possible while carrying whatever weapons you have, especially a P90 at bombsite B. It can also mean to carry any sort of volatile attack on a place using any sort of tactics or weapons. The B stands for Berlin, referring to the Soviet attack in Berlin on April 16th that ended World War II.

It is commonly used by Russian gamers playing CS:GO, and is often combined with Russian swears.
RUSH B! DURAK MUZHCHINA!
by MrWhomstDVe December 7, 2020
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rush b is a tactic used by noobs and some pros. its manly used by russians to storm objective b in csgo. people usually used a p90 and they are in terrorist side
by the vlad putin February 23, 2022
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When a CS:GO player rushes B site, usually with a P90, and urges his fellow terrorists with him. Originally used by Russian players, it is now used to mock said Russian players. Recently to mock them even more, Rush Berlin is said, referencing the Soviet Union's storming of Berlin.
Russian N00b: Rush B cyka blyat esli net idi nahui
Everyone else: *Vote kick Russian N00b*
Russian N00b: Chevo vi delaite? Nieeeeeeeeeet!!!
by RussianDumbass October 8, 2018
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"Rush B" is a tactic and the term is used mainly by the Russian CS:GO community, which means to rush towards the bombsite B as fast as possible with a P90. But since experienced players know what "Rush B" is, it will not work against them. And it was observed that new players often stormed the bombsite B.

DIFFERENT MEANINGS -

1)It is used against a newbie who will charge/storm bombsite B without a plan or cooperation.

2)But now it is often used to mock Russian players, because of the then Soviet Union which stormed into Berlin.
3)And it is a kind of a meme now.

So, depends on the context.
1)Player - "Quick, Rush B!!"

When they see a newbie -
2)Players - "Haha Rush B, Rush B!"
by Invisible Impostor September 8, 2020
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When the angry CS:GO russian starts screaming RUSH B Cyka Blyat because the team has no idea what to do
a team of noobs: What do we do they got A
The angry russian: RUSH B Cyka Blyat
by March 21, 2021
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When feeling uncomfortable when a person has strong feelings for you only after meeting them recently, you rush the relationship so as to make them feel uncomfortable making them leave you alone.
Person 1: 'i think i'm falling for you" Person 2: "when do you want to get married?"

Person 2: "She was falling for me even though we met a few days ago, so i just Rush B and she left me alone"
by Demonicsatyr March 14, 2017
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Phrase and tactic used by all russians and desperate silvers in CS. The strategy/tactic is for noobs, russian players, silvers and sometimes desperate professionals in cs:go which they have to purchase P90 and rush to bombsite b in de_dust2
by BakernBlyat March 2, 2017
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