ramnut

Verb or Noun. climbing bumbly unable to ascend shallowest granite slopes; brings parents to crag; assists other climbers by getting rope stuck; typically of Namibian descent. one can equate a ramnut with a dweeb or a loser or a retard or a dork or a tool but it is subtly distinct for several palpable reasons.

we couldn't get up there cos I had a ramnut for a partner!
Ramnut got the rope stuck!
Don't be such a ramnut, just do it!