I'll make you a
deal. I'll only be able to use this once, but when I've had
enough, when I just can't take it anymore, when I know I can't go any further
without you, I'll cry '
Mercy'! Until that point, I'll
schlepp around doin' my thing.
Come get me then. But I'll only say it one time.
(Saying 'when' is an expression used to say 'that's enough'. Generally when putting up with bullshit, rarely when filling a wine glass.)