Astro Wah Lai Toi

Astro Kah Lai Toi

What is the meaning of Wah, Kah and Lai? If I'm not mistaken, Toi means "channel" isn't it? 

Still remember my good old days where astro packages was still 'cheap'. We used to subscribe for all the channels back then and Wah lai Toi is one of my favourite channel although I'm Malay. TVB Drama was really good back then.  Square pegs, Golden Faith, War and beauty, Heart of Greed, Moonlight resonance, No regrets etc etc....