1) Ad-lib 2) Ad-lib comedy 3) Ad-lib comedy style 4) Ad-libbed bit 5) Ad-libbed comedy 6) Comedy genre 7) Comedy specialty 8) Comedy style 9) Comedy-club offering 10) Improvisation 11) Quick-thinking skill 12) Second City forte 13) Second city specialty 14) Some comedy 15) Some Second City skits 16) Some troupes do it 
Short hand for improvisation where an Actor comes up with lines on the spot, unrehearsed
improvisation.