Cytogenix (fka CYGX)

[hogger]

Great old expression ... we always took it to mean that someone was a little light in the smarts department ... when said by a spook or clan-com spec, it is a short form of "Why doncha go pound sand up your a$$."

More respectable explanation is:

The origin of the expression "go pound sand" is from a longer expression, not to know (have enough sense to) pound sand down a rathole.

Filling rat holes with sand is menial work, and telling someone to pound sand down a hole is like telling them to go fly a kite.

The expression dates to at least 1912 and is common in the midwestern United States.