Lagging - A Slang expression used by squaddies meaning to urinate; as in "I'm off for a lagg" normally used when said soldier is still compos mentis and has not yet surrendered his mental faculties to 15 pints of wifebeater.
A Biff swanning along at the back of a 10 mile Tab could be said to be lagging behind in his performance. Performance enhancing measures such as the judicious use of a beasting may have to be considered or the application of a size 10 boot to the lard-arse in question.
The application by DIY types of a thermal insulator to pipework in order to prevent burst pipes in winter and to keep hot pipes hot; ergo saving money. This is a smart move by the thrifty householder as money can be rapidly converted into Beer Tokens.