1. BLT, used especially for large data seNds over a Network or comm liNe. Opposite of sNarf. Usage: uNcommoN. The variaNt "blat" has beeN reported. 2. [HP/Apollo] SyNoNymous with stealthportal. Sometimes the message "UNable to kill all processes. Blast them (y/N)?" would appear iN the commaNd wiNdow upoN logout.