How do you legitimately bypass an electricity meter when you generate your own power to flow in through the same line?

There is no need to bypass the utility meter. In order to use power generated on site, you need to install what is called a transfer switch. The transfer switch selects either utility power (that comes through the meter), or site generated power, but never both at the same time. You then wire branch circuits from the transfer switch to the various lights, receptacles, etc. you want to power. You can buy transfer switches that have from one to 20 or more circuit breaker positions to do this.

Never, ever wire site generated power directly to utility-fed circuits!

This can cause severe damage, as well as hurt or kill people. If there is a power outage, and you are running your generator (or whatever), you can backfeed power onto the utility lines. The workers trying to fix the outage, can come in contact with the lines, thinking they are dead, not realizing you are backfeeding power to them. Be safe, use a transfer switch!

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.

If you do this work yourself, always turn off the power at the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicator
to insure the circuit is, in fact, de-energized.