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.)