Big Leg Emma lyrics

There's a big dilemma
'Bout my Big Leg Emma, uh-huh, oh yeah
There's a big dilemma
'Bout my Big Leg Emma, uh-huh, oh yeah
She used to knock me out
Until her face broke out

There's a big dilemma
'Bout my Big Leg Emma, uh-huh, oh yeah
There's a big dilemma
'Bout my Big Leg Emma, uh-huh, oh yeah
She was my steady date
Until she put on weight
etc.

Submitted by Guest

What do you think is the meaning of Big Leg Emma by Frank Zappa?