[steven]

I'm aware of that, but I'm pretty sure if you were to transcribe what they were actually saying it would just be く　and け. I have a general idea of where the phrases come from... I'm not so sure abuot け being 食え though. It makes sense judging by the sound, but the conversation would be like this (if I understood it correctly)

A: く？
Ｂ：け

In other words:

A:食べる？
B: うん、食べる

Besides, doesn't 食え mean like 食べ... I thought it was like 命令 when said that way. I've never said 食え and have never been told 食え as far as I remember though, so it's not something I use every day... but I don't think someone would say 食え to mean that they (personally) are gonna eat something.

EDIT: Haha, incidentally I had it all backwards, which makes way more sense now. け=食べる？ く=食べるよ.