not able to wait

not able to hold it (in)

No longer able to prevent oneself from urinating. I tried to sit through the rest of the movie, but I wasn't hold it anymore and raced out of the theater to use the bathroom. I was worried our son wouldn't be able to hold it until we got home.
See also: able, hold, not
Farlex Dictionary of Idioms.

not able to wait

to have to go to the bathroom urgently. (Also more broadly literal.) Mom, I can't wait. Driver, stop the bus! My little boy can't wait.
See also: able, not, wait
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • not able to hold it (in)
  • can't hold it (in)
  • hold (one's) water
  • hold water
  • keep (someone or something) in sight
  • keep in sight
  • keep sight of
  • keep sight of (someone or something)
  • keep sight of somebody/something
  • wash your hands of
References in periodicals archive
My patience is running out and I am not able to wait
Hopes for peace..
A hospital is not able to wait until a power company can come out and fix the problem.
On Site Energy provides Emergency Rental Solutions to Long Island Hospital
But in reality, new graduates are not able to wait for vacancies, as they come up in late summer/autumn/winter.
A new graduates plea
"We're not able to wait for this pope or the next pope to wait another hundred years to say, 'We made a mistake on birth control,' or the fact that we do allow women to be at least deacons in the church," he said.
Tennessee priest calls for pope to apologize about contraception teaching
Newcastle's most creative heavy rock band, Caged, are currently in the studio working on their much-anticipated debut album due for an early 2004 release, but those not able to wait that long for their next fix of alternative rock have been offered a taste of what's to come in the form of this, the band's second single.
Talent on doorstep