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The Free On-line Dictionary of Computing (foldoc)

1. /B-L-T/, /bl*t/ or (rarely) /belt/ Synonym for {blit}.
This is the original form of {blit} and the ancestor of
{bitblt}. It refers to any large bit-field copy or move
operation (one resource-intensive memory-shuffling operation
done on pre-paged versions of {ITS}, {WAITS} and {TOPS-10} was
sardonically referred to as "The Big BLT"). The jargon usage
has outlasted the {PDP-10} BLock Transfer instruction from
which {BLT} derives; nowadays, the {assembly language}
{mnemonic} {BLT} almost always means "Branch if Less Than
zero".

2. bacon, lettuce and tomato (sandwich).

[{Jargon File}]