The unofficial bastardized Latin motto of many organizations, particularly military units. "Semper", of course is the Latin word for "always". "Gumbi" refers to Gumby, a TV character made of clay. Thus, Semper Gumbi is translated as "Always Flexible."
G.I. Joe: "We were supposed to go back home a month ago but these Iraqis can't get their stuff together. Now we have to stay indefinitely."
G.I. Jack: "There's no use crying about it. Just suck it up and remember - Semper Gumbi."
This is a phrase that's become common in the London skating scene, and generally refers to new skaters who don't yet have much in the way of skating skills. Howvever, it's still possible for experienced skaters to make gumbie-esque mistakes too.
Despite the fact that he's been skating for 6 months now, he still skates like a total gumbie.
When your significant other fills there mouth with gummy bears and gets them nice and soft snd warm and even softer and then performs oral sex on their male counterparts testicles, also known as the sack...hence a gummisack