It's almost impossible to brick anything with software, and even in hardware unless you damage the PCB itself you can usually recover if you tried hard enough (e.g. Even if you fry a $1500 FPGA you could technically reflow a new one and pray the bitstream is OK if you need it fixed now - although I'd rather you than me)
I've always understood it to mean 'broken beyond software or high-level firmware repair'. i.e. if not actually a blown component, something needs to be reflashed which has an inaccessible JTAG header or something, rather than something 'higher level' like recovery images over ADB & USB.
https://www.merriam-webster.com/dictionary/brick
Under the 'verb' usage:
2 : to render (an electronic device, such as a smartphone) nonfunctional (as by accidental damage, malicious hacking, or software changes) // … those who dared hack the phone to add features … risked having it "bricked"—completely and permanently disabled—on the next automatic update …