I suspect what she heard was LIBOR (London InterBank Offered Rate) pronounced "leeber") ARMs (
Adjustable Rate Mortgages). They're variable rate mortgages, which used to be the exception rather than the norm in the USA. Many people took them during the heights of the property boom on a very low 5-year honeymoon rate, which will revert to "cost-of-funding" rates upon expiry of the honeymoon period. LIBOR is simply one of a number of reference rates that can be used to set mortgage interest rates.
I've heard the peak of these coming off is April 2009, July 2010 etc - ie it depends exactly which mortgages you include as to when this peak is.
The person claiming that 2011 is the peak must relate to 5 years from some supposed peak in 2006... at which time a large number of mortgages will go from, say, 3% (intro rate) to a market rate of perhaps 6%, doubling repayments.
Many people borrowed the maximum they could under a servicing model at 3% - don't ask me how the lenders let people do this, I guess that's why so many people are furious with the banks
- and won't be able to afford 6% repayments.
What they assumed, at that time, when the property market looked so wonderful, is that even though they knew they couldn't afford repayments at 6%, their property would have doubled in value in 5 years, so they could simply refinance and release enough to make mortgage payments for a few more years.
Of course this was all fine and dandy until it became apparent that the property not only wouldn't have doubled, but would possibly be worth less than purchase price.