When You're In Lyrics

Lyric discussion by sunofnothing 

Cover art for When You're In lyrics by Pink Floyd

i read in Wikipedia that "when you´re in" was a catch phrase some technician who worked with them used, but i don´t get it, what does it wanna say? ´cause he said: "i´m in, and when you´re in, you´re in"

Maybe it´s cause i don´t know a lot of English...