マンション

マンション can be translated as:

• flat
• apartment
• condominium
• condo

In English, mansion is a very big house. Another word is stately home. Very rich people live in a mansion.

上司

Here are some slang expressions that mean boss. These expressions are for the top person in the company:

• the big cheese
• the head honcho
• the big boss
• the top dog

三周年パーティー

Thank you everyone who came to the 3rd anniversary party. I really appreciate your support and look forward to seeing you at future anniversary parties.

We officially welcomed Stuart and his wife, Jessica, from New Zealand.

We enjoyed great Italian cuisine and interesting conversation, some of which was in English.

There were 18 people at the party.

脱法ハーブ

Recently, there has been a lot of news about a narcotic substance in Japan. This substance is a herbal drug that is legal and on sale in some shops. I don't know what this particular herbal drug is but the name is rather amusing: dappo herb「脱法ハーブ」which can't be translated perfectly but I think these are possible translations:

• legal drug
• legal high
• legal weed

脱法 can be best translated as:

• legal loophole

This is a natural expression used in normal conversation.

ハーブ　＝　麻薬

In English, herb is a slang word for plant-type narcotic drugs, such as cannabis; I guess Japanese has adopted this slang.

I wonder if the media reporting has increased interest and sales in 脱法ハーブ。It's like stealth marketing（ステマ）。

人気

all the rage（形容詞）

• temporarily popular
• fashionable
• in vogue

Examples:

• Nordic walking is all the rage in Japan.
• Korean pop music is all the rage now.
• Harem pants are all the rage this year.

A word with the same meaning is fad（名詞）

• The banana diet was a fad.