So change it to...
ck and Jill up the hill holding a silly leaf
At the top they sat and smoked some reef
Jack Got high
Started to unzip his fly
And Jill smirked "where's the beef"
Jack and Jill went up the hill to smoke a little reef.
Jack got high
Unzipped his fly
And Jill said "where's the beef"?
Limericks are five lines with an AABBA rhyme pattern
Someone has to enforce the rules.
Otherwise, you could have your poetic license revoked
Related Link: Note the use of the word "strict".
ck and Jill up the hill holding a silly leaf
At the top they sat and smoked some reef
Jack Got high
Started to unzip his fly
And Jill smirked "where's the beef"