Chugging is a British portmanteau of Charity and Mugging. It refers to the tag-team clipboard-wielding signers-for-hire fundraisers who've staked out almost every city block these days. "Have a minute to save the whales?" "Give a minute to save the children?" "Take a minute for human rights?" "Got a minute for gay marriage?" They call out as you feel guiltier and guiltier about your walk to lunch. If you do stop they'll take far more than a minute - they'll keep talking to you until you surrender your name, address, and a donation. If you give them the first two, you will be bombarded with requests for the third.
A 2009 survey in Britain showed that 2/3 of people crossed the street to avoid these folks and 1/4 lied to them about having "given already."
In California, a state where ballot initiatives have replaced and run over representative democracy, you might avoid a chugger only to be stopped by another clipboard. This one is also wielded by someone getting paid by the signature - asking you to "balance the state budget-throw the bums out-fix Sacramento-sell bonds for the high speed rail/new prisons/ school and hospital facilities while approving pay raises for elected officials." And, of course, when you finally get past the chuggers, and past the petition-signers and get to the deli to buy your lunch, you'll be asked to "round up" your check for charity.
Ho Ho Ho.