Tim and Andy were playing and got their dingers stuck together when they both were aroused.The circumcised penis got stuck in the foreskin of the uncircumcised penis. It reminded them of their youth when they played the real Chinese finger trap game. Now they play the Chinese dinger trap game after Hockey practice.
Slang used in London, means unregistered car which tends to be bought for a cheap price. Not insured or taxed etc, used for joyrides and to commit crime.