This is likely a bug in Sitecore 8.2, as earlier versions of Sitecore 8 prevent you from removing the last strip from the ribbon, as can be see in the following screenshot:
Resolving the Issue
I suggest that you try to work around the issue by opening up Chrome Dev Tools (via F12 in your chrome browser) or Firebug (or whatever Mozilla calls it these days; via F12 in FireFox), and search for the (div) element with
id="Ribbon". If it is there, update it so that it has a reasonable
height and make sure that it is set to
display: block (all via CSS), in order to make it visible. Then right-click the element and the Context Menu should appear, allowing you to add back one or more ribbon strips.
If you are unable to find the (div) element with
id="Ribbon" then try doing the same thing for the (div) element with
id="RibbonPanel". That one should render no matter what (even if it isn't displaying, due to content/CSS/etc).
If you still cannot fix the issue, try going into the User Manager, selecting your user and clicking the "Reset Settings" button. I have not tested this one myself, but it may work, as well.