to be a 50 pounder

A 50 pounder is a consultant or advisor that gives unsolicited and useless advice, with the ulterior motive of getting paid for his apparently "quality" services. He is a salesperson, good with words, that can trick a naive person.

The 50 pounder is actually skint and has very little money in their bank account (about £50). When confronted, the 50 pounder gets aggressive due to his/her fear of being exposed.

To be avoided via good bullshit detectors and due diligence.

Dude, stop talking to him. He's a scam and his greatest achievement was only to be a 50 pounder.

don't be such a sputnik

A sputnik is a guy who orbits around a woman, pretending to be her friend, with the ulterior and covert motive of becoming her lover.

Sputnik is a reference to the first artificial Earth satellite. Similar to the satellite that orbits Earth, the guy orbits the female friend, hoping for more. Therefore, he is an orbital.

Max, don't be such a sputnik! You do her homework daily but haven't even asked her out yet.