noun
immediate reply; instant response
Slang noun for replying to an email, message, or online post right away. Often used in casual digital communication.
See also: レス
彼はいつも即レスだから助かる。
He always replies immediately, so it's helpful.
即レスが欲しいなら電話したほうが早いよ。
If you want an instant reply, it's faster to call.