Pronounced jack-stal
Verb: To quit or pull out of something because you are rubbish at it.
Noun: Someone who frequently quits things or has recently quit something because they were doing badly.
'i got an E in Latin in the mock exam. I think I might jackstall it.'

'I'm rubbish at Latin, I think I might quit.'
'You're such a jackstall.'
by please accept. i cba try again December 28, 2016
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V. The act of beating your meat in school during school hours.
Guy 1: Hey where the fuck where you in AP special Ed?
Guy 2: I skipped and pulled a shaft jackstall in the bathroom".
by Big_nig_6969 May 20, 2018
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