Definition of pingos:
(n) :
(geomorphology) A conical mound of earth with an ice core caused by permafrost uplift, particularly if lasting more than a year.
(n) :
(Sri Lanka, dated) A flexible pole supported on one shoulder, with a load suspended from each end.
(n) :
(Sri Lanka, dated) A measure of weight equivalent to that which can be carried using a pingo, perhaps about 55 pounds (25 kilograms) (see the 2013 quotation).