Jamberoo buried any doubt about their top-five credentials with Saturday's convincing 30-22 defeat of title holders Gerringong at Kevin Walsh Oval.
The win came after the previous week's home victory over Milton-Ulladulla and put the Superoos one point ahead of Gerringong in the battle for finals spots.
Jamberoo held a 30-10 lead before the Lions closed the gap with two late converted tries.
Superoos captain-coach Matt Coelho believes his side has a new lease of life after enduring a recent four-game losing sequence.
"We know we're a chance now," Coelho said.
"The confidence we got out of that is going to be massive. Hopefully, we can keep it going and go on a big winning streak."
Coelho crossed for two tries, while Mark Asquith, Robbie Noble and Josh Saunders also scored. Fullback Jarrod Schodde kicked five goals.
Gerringong's points came from tries to Joel Roberts, Pat Cronin, Kal Collins and Chris Mann, while Roberts booted three conversions.
Jamberoo were up 12-6 at half-time before the Lions scored early in the second half to make it 12-10.
The home side raised the bar again, taking control with three unanswered tries in 15 minutes.
"It was one of the best wins I've been involved with," Coelho said.
"Our talk and our enthusiasm really stood out. We just out-enthused them, and it really showed on the field and on the scoreboard.
"We hadn't beaten them in four years and we were taking it like a grand final. After every try, everyone was running in and you could see how much it meant to us. We belted out a pretty good victory song at the end."
Coelho has already warned his team about under-estimating last-placed Port Kembla this weekend.
"We can't just show up and think we're going to win the game. We'll lose if we have that attitude because they're a good team," he said.
"We had five out against Gerringong and we've got a few coming back. That'll be a bit of a headache for me, but it's a good headache."