Answer: atoot

AnswerCrossword Clue
ATOOT

Go on .. (carouse)

ATOOT

On ... (doing some heavy drinking)

ATOOT

On ... (spreeing)

ATOOT
On ... (carousing)
ATOOT
On ... (drinking and carousing)
ATOOTOn ...: spreeing
ATOOTOn ..: reveling
ATOOTReveling, after "on"
ATOOTOn ... (making merry)
ATOOTGo on ... (make merry)
ATOOTOn ... (reveling)
ATOOTOn ... (bingeing)
ATOOTGo on ... (carouse)
ATOOTOn .. (spreeing)