"快速吃午饭"的英文表达是 "eat lunch quickly" 或者 "have a quick lunch". 这个表达方式源自英语中常用的动词短语 "eat lunch"（吃午饭）和副词 "quickly"（快速地）的结合。
下面是一些英文例句以及它们的中文翻译：
I need to eat lunch quickly because I have a meeting at 1:00. (我需要快速吃午饭，因为我1:00有个会议。)
She always has a quick lunch because she has a lot of work to do. (她总是迅速吃午饭，因为她有很多工作要做。)
We decided to eat lunch quickly so we could get back to work. (我们决定快速吃午饭，这样就能回去工作了。)
He ate lunch quickly because he was in a rush. (他迅速吃午饭，因为他很匆忙。)