To Illegally Download stuff off the Internet and what your trying to download becomes slow and unresponsive because of the server.
"OMG!! Im Fucking sick of this Bootlag!!"
by Marty Evans December 08, 2006
1 more definition
To sell something illegal at the wrong time.
"Oh no, the cops are coming, did you just bootlag something?"
by xladymelodyx July 25, 2006