Is there a concise word that describes those type of ideas or points in an argument are pathetically desperate and really scraping the bottom barrel nature?

There isn't one perfect, concise word, but here are some options depending on the nuance you want to convey:

For desperation:

* Desperate: This is the most direct and simple option.

* Pitiful: Emphasizes the sense of sadness or lack of merit.

* Pathetic: Similar to "pitiful," but with an added element of disgust.

* Last-ditch: This highlights the desperate nature of the argument, suggesting it's a final, weak effort.

For bottom-of-the-barrel quality:

* Trite: Indicates overused and unoriginal ideas.

* Banal: Similar to "trite," but with a stronger emphasis on being dull and lacking in substance.

* Cheap: Implies the ideas are low-quality and not worth the effort.

* Weak: Straightforwardly describes the argument's lack of strength and persuasiveness.

For a combination:

* Lame: Conveys both desperation and low quality.

* Flimsy: Suggests a lack of strength and evidence.

* Straw-grasping: Highlights the desperation to cling to any argument, no matter how weak.

* Desperate gambit: Emphasizes both the desperation and the strategic nature of the argument.

The best choice will depend on the specific context and the tone you wish to convey.