milf in training 

a hott woman who happens to be pregnant

if Eva Lonoria was pregnant, she would be a "milf in training"

milf in training by kenny callinan March 28, 2008

milf in training 

An attractive woman who does not have any children yet, but hopes to someday, so she can become an actual milf.

See Britney Spears

Britney Spears was photographed wearing a T-shirt that said, "MILF in training"

What a stupid whore.

milf in training by S_t_G December 26, 2004