metric buttload n. a large but indeterminate quantity. Also metric ass-load, metric fuck-load, metric shit-load. (source: Double-Tongued Dictionary)
Further reading
J.P. in Temecula, California, is a high schooler studying French and Spanish. He notes that the Spanish word con means “with” and English has some linguistically related words, such as congress, which suggests “coming...
In Cockney rhyming slang, apples and pears is a synonym for “stairs,” and dustbin lids means kids. Plus, sniglets are clever coinages for things we don’t already have words for. Any guesses what incogsneeto means? It’s the...
I don’t know if you care about etymology, but it seems to be derived by analogy to ‘metric ton’ (1 Mg or 1000 Kg), which is about 10% larger than the ‘short ton’ of 2000 lbs. commonly referred to as ‘ton’ in the US. Therefore, a ‘metric assload’ would be even larger than a normal assload.
I read about this in “the Writer” and just had to respond. I ended up writing a blog about it. http://logikalblog.com/2009/11/17/metric-buttload/