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Related to trolly: Trolley problem

be off (one's) trolley

slang To be crazy and/or wacky. Usually used humorously. Don't listen to a word he says, he's off his trolley! You're off your trolley if you think that plan will work.
See also: off, trolley

now you're on the trolley

Now you understand what I mean or how to do this. A: "So this piece slots in here, and we connect these two wires together, right?" B: "Yeah, now you're on the trolley!"
See also: now, on, trolley
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

Now you're on the trolley

Now you catch on. “Trolley” refers to the streetcars that predated buses and subways in major cities. To flounder around to the answer to a question or how to perform some sort of procedure and then to come up with the right answer was the equivalent of getting on a trolley that's on the right track (as in track of streetcar rails).
See also: now, on, trolley
Endangered Phrases by Steven D. Price Copyright © 2011 by Steven D. Price
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References in periodicals archive ?
A model is found in a shopping trolly dead and badly mutilated, but Cath Williows is on the case.
According to ASF sources one kilogram heroin has been recovered from trolly bag of a Sharja bound passenger which was to be smuggled to Sharja .
During checking, ANF staff recovered 13.1 kg heroin concealed in trolly bags.
According to the details, a speedy tractor trolly hit the motorcycle rider resulting woman killed on the spot.