What is "tagging on"

Usage examples of "tagging on".

Now he was tagging on to the fifteen year olds, the cocks of the walk who had already been in and out of detention centres.

I thought, when Al comes home, it'll be like old times, the two of us playing and working together, talking all the time, me tagging on, doing everything together.

And round this futile stuff hundreds of skilled workers are grouped, costing the country tens of thousands per annum, and tagging on to them are thousands of others who in effect have no real job but have found themselves a quiet niche and are sitting in it pretending to work.

With the arrival of the next party, I hacked a bollard out of a block of ice nearby and had the ends of the rope run through blocks and round this ice-bollard with men tagging on the ends.