In Hindi, the term jugaad means something like "jury-rigged" in English. With jugaad, the idea is that you don't have the tool or material you need, so you rig something up with what you do have.
Here's an example. The established way to locate a leak in a tire is to spray it with soapy water, then look for the bubbles. This guy either didn't have access to water/soap/spray bottles, or maybe just wanted to make his work more fun. Here's his jugaad leak detector:
For those with poor eyesight, it's also a darn sight easier to see than soapy bubbles.