Slamma

As defined by the Cleasby & Vigfusson Old Norse to English dictionary:

slamma

að, to shamble along, walk like a bear.

Possible runic inscription in Younger Futhark:ᛋᛚᛅᛘᛘᛅ
Younger Futhark runes were used from 8th to 12th centuries in Scandinavia and their overseas settlements