like a rat up a drainpipe
Very hastily and opportunistically. Like rats up a drainpipe, scalpers started snatching up as many tickets for the concert as they could so they could resell them to fans at greatly increased prices. The staff at these stores always rush over to you like rats up a drainpipe, eager to convince you to buy several things you don't need.
like a rat up a drainpipe
with great and opportunistic speed and vigour. informal 2005 Scotland on Sunday Give Bazalgette an opening, and he's in there, like a rat up a drainpipe.