It’s like someone small (not literally) trying to accomplish big stuff. i.e. new worker in a company trying to hang out with the CEO or the board members in hope of getting a promotion. “khud itney chotey ho, aur kaam itney barey karney ki koshish”…like a lizard is small and he/she hugs wood beams (something very large).
p.s. For future reference, you can just PM me about any punjabi questions