:loop through: vt. To process each element of a list of things.
"Hold on, I've got to loop through my paper mail." Derives from
the computer-language notion of an iterative loop; compare `cdr
down' (under {cdr}), which is less common among C and UNIX
programmers. ITS hackers used to say `IRP over' after an
obscure pseudo-op in the MIDAS PDP-10 assembler.
-- The AI Hackers Dictionary
dup loop: /d[y]oop loop/ (also `dupe loop') [FidoNet] n. An
infinite stream of duplicated, near-identical messages on a FidoNet
{echo}, the only difference being unique or mangled identification
information applied by a faulty or incorrectly configured system or
network gateway, thus rendering {dup killer}s ineffective....