Another "Big Brother" houseguest is on the outs with their employer ... this time it's Spencer Clawson, whose company is already laying the groundwork to hand him his walking papers.

Clawson has been captured on "BB" cams calling one houseguest "Kermit the F**" and praising Hitler as a gifted speaker.

Clawson serves as a railroad conductor for Union Pacific, who released a statement on their website saying, "The values represented by Spencer Clawson's comments during the Big Brother show do not at all align with Union Pacific's values."

They continued, "Mr. Clawson is on unpaid leave of absence while participating on Big Brother. Union Pacific does not condone his comments."

They ended their statement by saying they are "acting in accordance with Collective Bargaining Agreement terms regarding Mr. Clawson" ... which sounds like they are setting the stage to fire his ass first chance they get.